A051571 Consider problem of placing N queens on an n X n board so that each queen attacks precisely k others. Here k=4 and sequence gives number of different solutions when N takes its maximal value.

0, 0, 0, 1, 3, 40, 615, 16573

Offset

3,5

References

M. Gardner, The Last Recreations, Springer, 1997, p. 282.

Links

Table of n, a(n) for n=3..10.

Crossrefs

Cf. A051567-A051570, A051754-A051759, A019654.

Sequence in context: A005724 A215196 A093376 * A019654 A361069 A327070

Adjacent sequences: A051568 A051569 A051570 * A051572 A051573 A051574

Keyword

nonn,more

Author

N. J. A. Sloane

Extensions

Probably an incorrect version of A019654.

Status

approved