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A055903 Column 7 of triangle A055898. 0
1, 15, 141, 939, 4971, 21981, 84351, 287961, 891564, 2539756, 6733764, 16769916, 39526524, 88722756, 190653804, 393952284, 785736369, 1517620599, 2846653381, 5198360739, 9261986019, 16131790389, 27513326919, 46020006201 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..30.

A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189 (H_7 for square lattices of Section 6).

CROSSREFS

Sequence in context: A056281 A000481 A215765 * A026859 A096046 A093117

Adjacent sequences:  A055900 A055901 A055902 * A055904 A055905 A055906

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 13 2000

STATUS

approved

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Last modified April 20 23:07 EDT 2014. Contains 240824 sequences.