A287229 -id:A287229 - cp's OEIS frontend

A287204 Number of independent vertex sets and vertex covers in the n-triangular honeycomb acute knight graph.

2, 8, 27, 144, 1331, 13824, 208575, 4741632, 140608000, 5870657088, 350253538649, 28635764824584, 3270761581689147, 524882236329014264, 117025388905265182783, 36405238728128712859232, 15833111238624255435917875, 9599917578598545475054063616

Offset: 1

Eric W. Weisstein, May 21 2017

nonn

Also row sums of A244500.

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 Vertex Set
Eric Weisstein's World of Mathematics, Vertex Cover

Cf. A244500 (coefficients of independence polynomial of triangular honeycomb acute knight graphs).

Cf. A287195, A289902, A287230, A287229, A027740.

a(15)-a(18) from Andrew Howroyd, Jul 17 2017

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

Original entry on oeis.org

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

Offset: 1

Eric W. Weisstein, May 22 2017

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

Cf. A287229, A287230.

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

cp's OEIS Frontend

A287204 Number of independent vertex sets and vertex covers in the n-triangular honeycomb acute knight graph.

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