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 A055899 Column 3 of triangle A055898. 2
 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 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^2+2x^3+x^4)/((1-x)^7(1+x)^2). [Corrected by Georg Fischer, Aug 16 2021] MATHEMATICA CoefficientList[Series[(1+2*x+4*x^2+2*x^3+x^4)/((1-x)^7*(1+x)^2), {x, 0, 40}], x] (* Georg Fischer, Aug 16 2021 *) CROSSREFS Cf. A055898 (triangle), A055900 (column 4), A055901 (5), A055902 (6), A055903 (7), A055904 (8). Sequence in context: A193437 A199921 A192596 * A218956 A139876 A222265 Adjacent sequences:  A055896 A055897 A055898 * A055900 A055901 A055902 KEYWORD nonn,easy AUTHOR Christian G. Bower, Jun 13 2000 STATUS approved

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Last modified August 13 05:18 EDT 2022. Contains 356077 sequences. (Running on oeis4.)