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A151541
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Number of 2-sided triangular strip polyedges with n cells.
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15
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1, 3, 8, 32, 123, 523, 2201, 9443, 40341, 172649, 736926, 3141607, 13367012
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OFFSET
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1,2
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COMMENTS
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Also number of unrooted self-avoiding walks of n steps on hexagonal [ =triangular ] lattice. - Hugo Pfoertner, Jun 23 2018
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LINKS
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Table of n, a(n) for n=1..13.
Ed Pegg, Jr., Illustrations of polyforms
Hugo Pfoertner, Illustration of ratio A001334(n)/a(n) using Plot2.
Eric Weisstein's World of Mathematics, Polyedge
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CROSSREFS
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Cf. A037245, A151539, A151540, A159867, A266925.
Asymptotically approaches (1/24)*A001334(n) for increasing n.
Sequence in context: A148913 A148914 A148915 * A022563 A103939 A094610
Adjacent sequences: A151538 A151539 A151540 * A151542 A151543 A151544
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KEYWORD
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nonn,walk,hard,more
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AUTHOR
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Ed Pegg Jr, May 13 2009
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EXTENSIONS
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a(9)-a(13) from Joseph Myers, Oct 05 2011
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STATUS
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approved
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