A055900 - OEIS

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A055900

Column 4 of triangle A055898.

1, 9, 51, 209, 696, 1980, 5000, 11475, 24375, 48545, 91581, 164934, 285376, 476784, 772416, 1217610, 1873125, 2819025, 4159375, 6027615, 8592936, 12067484, 16714776, 22859109, 30896411, 41306265, 54665625, 71663900 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`4,2`
	LINKS	`Table of n, a(n) for n=4..31.` `A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_4 for square lattices of Section 6).`
	FORMULA	`G.f.: x^4(1+3x+9x^2+9x^3+9x^4+3x^5+x^6)/((1-x)^9(1+x)^3).`
	CROSSREFS	`Sequence in context: A034814 A034816 A140381 * A054549 A005746 A220236` `Adjacent sequences: A055897 A055898 A055899 * A055901 A055902 A055903`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower, Jun 13 2000`
	STATUS	`approved`

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Last modified May 22 00:16 EDT 2013. Contains 225508 sequences.