1 ]=> (queens 3)

;Value: ()

1 ]=> (queens 4)

;Value 38: ((3 1 4 2) (2 4 1 3))

1 ]=> (queens 5)

;Value 39: ((4 2 5 3 1) (3 5 2 4 1) (5 3 1 4 2) (4 1 3 5 2) (5 2 4 1 3) (1 4 2 5 3) (2 5 3 1 4) (1 3 5 2 4) (3 1 4 2 5) (2 4 1 3 5))

1 ]=> (queens 6)

;Value 40: ((5 3 1 6 4 2) (4 1 5 2 6 3) (3 6 2 5 1 4) (2 4 6 1 3 5))

1 ]=> (queens 8)

;Value 41: ((4 2 7 3 6 8 5 1) (5 2 4 7 3 8 6 1) (3 5 2 8 6 4 7 1) (3 6 4 2 8 5 7 1) (5 7 1 3 8 6 4 2) (4 6 8 3 1 7 5 2) (3 6 8 1 4 7 5 2) (5 3 8 4 7 1 6 2) (5 7 4 1 3 8 6 2) (4 1 5 8 6 3 7 2) (3 6 4 1 8 5 7 2) (4 7 5 3 1 6 8 2) (6 4 2 8 5 7 1 3) (6 4 7 1 8 2 5 3) (1 7 4 6 8 2 5 3) (6 8 2 4 1 7 5 3) (6 2 7 1 4 8 5 3) (4 7 1 8 5 2 6 3) (5 8 4 1 7 2 6 3) (4 8 1 5 7 2 6 3) (2 7 5 8 1 4 6 3) (1 7 5 8 2 4 6 3) (2 5 7 4 1 8 6 3) (4 2 7 5 1 8 6 3) (5 7 1 4 2 8 6 3) (6 4 1 5 8 2 7 3) (5 1 4 6 8 2 7 3) (5 2 6 1 7 4 8 3) (6 3 7 2 8 5 1 4) (2 7 3 6 8 5 1 4) (7 3 1 6 8 5 2 4) (5 1 8 6 3 7 2 4) (1 5 8 6 3 7 2 4) (3 6 8 1 5 7 2 4) (6 3 1 7 5 8 2 4) (7 5 3 1 6 8 2 4) (7 3 8 2 5 1 6 4) (5 3 1 7 2 8 6 4) (2 5 7 1 3 8 6 4) (3 6 2 5 8 1 7 4) (6 1 5 2 8 3 7 4) (8 3 1 6 2 5 7 4) (2 8 6 1 3 5 7 4) (5 7 2 6 3 1 8 4) (3 6 2 7 5 1 8 4) (6 2 7 1 3 5 8 4) (3 7 2 8 6 4 1 5) (6 3 7 2 4 8 1 5) (4 2 7 3 6 8 1 5) (7 1 3 8 6 4 2 5) (1 6 8 3 7 4 2 5) (3 8 4 7 1 6 2 5) (6 3 7 4 1 8 2 5) (7 4 2 8 6 1 3 5) (4 6 8 2 7 1 3 5) (2 6 1 7 4 8 3 5) (2 4 6 8 3 1 7 5) (3 6 8 2 4 1 7 5) (6 3 1 8 4 2 7 5) (8 4 1 3 6 2 7 5) (4 8 1 3 6 2 7 5) (2 6 8 3 1 4 7 5) (7 2 6 3 1 4 8 5) (3 6 2 7 1 4 8 5) (4 7 3 8 2 5 1 6) (4 8 5 3 1 7 2 6) (3 5 8 4 1 7 2 6) (4 2 8 5 7 1 3 6) (5 7 2 4 8 1 3 6) (7 4 2 5 8 1 3 6) (8 2 4 1 7 5 3 6) (7 2 4 1 8 5 3 6) (5 1 8 4 2 7 3 6) (4 1 5 8 2 7 3 6) (5 2 8 1 4 7 3 6) (3 7 2 8 5 1 4 6) (3 1 7 5 8 2 4 6) (8 2 5 3 1 7 4 6) (3 5 2 8 1 7 4 6) (3 5 7 1 4 2 8 6) (5 2 4 6 8 3 1 7) (6 3 5 8 1 4 2 7) (5 8 4 1 3 6 2 7) (4 2 5 8 6 1 3 7) (4 6 1 5 2 8 3 7) (6 3 1 8 5 2 4 7) (5 3 1 6 8 2 4 7) (4 2 8 6 1 3 5 7) (6 3 5 7 1 4 2 8) (6 4 7 1 3 5 2 8) (4 7 5 2 6 1 3 8) (5 7 2 6 3 1 4 8))