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%I #6 Aug 17 2021 02:49:01
%S 1,15,141,939,4971,21981,84351,287961,891564,2539756,6733764,16769916,
%T 39526524,88722756,190653804,393952284,785736369,1517620599,
%U 2846653381,5198360739,9261986019,16131790389,27513326919,46020006201
%N Column 7 of triangle A055898.
%H A. J. Guttmann, <a href="https://doi.org/10.1016/S0012-365X(99)00262-9">Indicators of solvability for lattice models</a>, Discrete Math., 217 (2000), 167-189 (H_7 for square lattices of Section 6).
%Y Cf. A055898.
%K nonn
%O 7,2
%A _Christian G. Bower_, Jun 13 2000