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 A036418 Number of self-avoiding polygons with perimeter n on hexagonal [ =triangular ] lattice. 3
 0, 0, 2, 3, 6, 15, 42, 123, 380, 1212, 3966, 13265, 45144, 155955, 545690, 1930635, 6897210, 24852576, 90237582, 329896569, 1213528736, 4489041219, 16690581534, 62346895571, 233893503330, 880918093866, 3329949535934 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice. REFERENCES B. D. Hughes, Random Walks and Random Environments, Oxford 1995, vol. 1, p. 459. LINKS I. Jensen, Table of n, a(n) for n = 1..60 (from link below) I. Jensen, More terms G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2 CROSSREFS Cf. A001334. Sequence in context: A006403 A129960 A115098 * A120589 A110181 A141351 Adjacent sequences:  A036415 A036416 A036417 * A036419 A036420 A036421 KEYWORD nonn,walk AUTHOR STATUS approved

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