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A350612 Number of sparse solutions to the Xqueens problem on an n X n board. 1
0, 0, 0, 1320, 178584, 113260460, 146777600320 (list; graph; refs; listen; history; text; internal format)
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: A185464 A323802 A161586 * A013641 A295449 A092088

Adjacent sequences:  A350609 A350610 A350611 * A350613 A350614 A350615

KEYWORD

nonn,more

AUTHOR

Don Knuth, Jan 16 2022

STATUS

approved

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Last modified May 23 14:15 EDT 2022. Contains 353975 sequences. (Running on oeis4.)