A055915 - OEIS

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A055915

Column 9 of triangle A055907.

1, 18, 164, 1050, 5367, 23232, 88125, 299992, 932849, 2685747, 7235237, 18392853, 44427807, 102552852, 227298680, 485679518, 1003915611, 2013360324, 3927664296, 7469755903, 13876848040, 25225619858, 44911485414 (list; graph; refs; listen; history; internal format)

	OFFSET	`9,2`
	LINKS	`A. J. Guttmann and A. R. Conway, Hexagonal lattice directed site animals, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999 (H_9 for hexagonal lattices Table 1).`
	FORMULA	`G.f.: x^9B(x)/((1-x)^19(1+x)^9(1+x^2)^8(1+x^2+x^4)^6(1+x^4)^4(1+x^2+x^4+x^6+x^8)^2) where B(x) is g.f. of A055918.`
	CROSSREFS	`Sequence in context: A008418 A099196 A041618 * A071539 A125381 A126539` `Adjacent sequences: A055912 A055913 A055914 * A055916 A055917 A055918`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 22 2000`

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Last modified February 15 05:15 EST 2012. Contains 205694 sequences.