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A287230 Number of matchings in the n-triangular honeycomb acute knight graph. 4
1, 1, 8, 64, 1331, 64000, 6400075, 1404928000, 677298787768, 712186032947200, 1635557819719974912, 8209592592625295700893, 90036881979773511965369428, 2157454308508779392217680572439 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

Stan Wagon, Graph Theory Problems from Hexagonal and Traditional Chess, The College Mathematics Journal, Vol. 45, No. 4, September 2014, pp. 278-287.

Eric Weisstein's World of Mathematics, Independent Edge Set

Eric Weisstein's World of Mathematics, Matching

CROSSREFS

Cf. A289143, A287204, A289904, A287228, A269869.

Sequence in context: A293144 A111984 A278145 * A154710 A069033 A087337

Adjacent sequences:  A287227 A287228 A287229 * A287231 A287232 A287233

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, May 22 2017

EXTENSIONS

a(11) from Eric W. Weisstein, Jun 25 2017

a(12)-a(14) from Andrew Howroyd, Jul 17 2017

STATUS

approved

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Last modified October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)