A055908 - OEIS

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A055908

Column 2 of triangle A055907.

1, 4, 10, 21, 39, 67, 107, 163, 238, 337, 463, 622, 818, 1058, 1346, 1690, 2095, 2570, 3120, 3755, 4481, 5309, 6245, 7301, 8484, 9807, 11277, 12908, 14708, 16692, 18868, 21252, 23853, 26688, 29766, 33105, 36715, 40615, 44815, 49335, 54186 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	LINKS	`A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_2 for hexagonal lattices of Section 6).`
	FORMULA	`G.f.: x^2(1 + x + x^3)/((1 - x)^5(1+x)^2(1 + x^2)).`
	CROSSREFS	`Sequence in context: A009898 A008121 A049480 * A023538 A085360 A024988` `Adjacent sequences: A055905 A055906 A055907 * A055909 A055910 A055911`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jun 14 2000`

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Last modified February 16 08:59 EST 2012. Contains 205903 sequences.