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A350614 Number of solutions to the Xqueens problem on a 2n X 2n board that are both sparse and paired. 3
0, 140, 317544, 54472800228 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..4.

Don Knuth, Xqueens and Xqueenons, 2021.

CROSSREFS

Cf. A350611-A350613.

Sequence in context: A211420 A185402 A216729 * A058939 A214376 A165600

Adjacent sequences:  A350611 A350612 A350613 * A350615 A350616 A350617

KEYWORD

nonn,more

AUTHOR

Don Knuth, Jan 16 2022

STATUS

approved

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Last modified September 29 07:42 EDT 2022. Contains 357090 sequences. (Running on oeis4.)