A287228 Number of matchings in the n-triangular honeycomb obtuse knight graph.

1, 1, 1, 27, 2376, 298062, 66426798, 47833036802, 119487298588717, 857547047985463278

Offset

1,4

Links

Table of n, a(n) for n=1..10.

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. A287229, A287230.

Sequence in context: A272630 A060629 A373448 * A086206 A395205 A323314

Adjacent sequences: A287225 A287226 A287227 * A287229 A287230 A287231

Keyword

nonn,more

Author

Eric W. Weisstein, May 22 2017

Extensions

a(9)-a(10) from Andrew Howroyd, Jul 17 2017

Status

approved