A350612 Number of sparse solutions to the Xqueens problem on an n X n board.

0, 0, 0, 1320, 178584, 113260460, 146777600320

Offset

1,4

Links

Table of n, a(n) for n=1..7.

Don Knuth, Xqueens and Xqueenons, 2021.

Crossrefs

Cf. A350611-A350614.

Sequence in context: A069737 A185464 A323802 * A013641 A295449 A092088

Adjacent sequences: A350609 A350610 A350611 * A350613 A350614 A350615

Keyword

nonn,more

Author

Don Knuth, Jan 16 2022

Status

approved