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A055899 Column 3 of triangle A055898. 1
1, 7, 31, 101, 272, 636, 1340, 2600, 4725, 8135, 13391, 21217, 32536, 48496, 70512, 100296, 139905, 191775, 258775, 344245, 452056, 586652, 753116, 957216, 1205477, 1505231, 1864695, 2293025, 2800400, 3398080, 4098496, 4915312 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..34.

A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_3 for square lattices of Section 6).

FORMULA

G.f.: x^3(1+2x+4x^2x+2x^3+x^4)/((1-x)^7(1+x)^2).

CROSSREFS

Sequence in context: A193437 A199921 A192596 * A218956 A139876 A222265

Adjacent sequences:  A055896 A055897 A055898 * A055900 A055901 A055902

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 13 2000

STATUS

approved

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Last modified July 22 06:33 EDT 2019. Contains 325216 sequences. (Running on oeis4.)