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A055910 Column 4 of triangle A055907. 0
1, 8, 36, 128, 388, 1050, 2601, 6013, 13141, 27416, 55012, 106816, 201685, 371828, 671630, 1192093, 2084360, 3597991, 6143128, 10391369, 17439285, 29073358, 48199071, 79535657, 130740732, 214230558, 350125952, 571019573, 929690344 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..32.

A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_4 for hexagonal lattices of Section 6).

FORMULA

G.f.: x^4(1+3x+4x^2+10x^3+12x^4+14x^5+16x^6+13x^7+14x^8+7x^9+6x^10+4x^11+x^13)/((1-x)^9(1+x)^4(1+x^2)^3(1-x-x^2)(1+x+x^2)).

CROSSREFS

Sequence in context: A276279 A210379 A131123 * A022573 A014477 A034998

Adjacent sequences:  A055907 A055908 A055909 * A055911 A055912 A055913

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 14 2000

STATUS

approved

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Last modified September 22 12:19 EDT 2019. Contains 327307 sequences. (Running on oeis4.)