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A151541 Number of 2-sided triangular strip polyedges with n cells. 14

%I

%S 1,3,8,32,123,523,2201,9443,40341,172649,736926,3141607,13367012

%N Number of 2-sided triangular strip polyedges with n cells.

%C Also number of unrooted self-avoiding walks of n steps on hexagonal [ =triangular ] lattice. - _Hugo Pfoertner_, Jun 23 2018

%H Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a>

%H Hugo Pfoertner, <a href="https://oeis.org/plot2a?name1=A001334&amp;name2=A151541&amp;tform1=untransformed&amp;tform2=untransformed&amp;shift=0&amp;radiop1=ratio&amp;drawpoints=true">Illustration of ratio A001334(n)/a(n) using Plot2</a>.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Polyedge.html">Polyedge</a>

%Y Cf. A037245, A151539, A151540, A159867, A266925.

%Y Asymptotically approaches (1/24)*A001334(n) for increasing n.

%K nonn,walk,hard,more

%O 1,2

%A _Ed Pegg Jr_, May 13 2009

%E a(9)-a(13) from _Joseph Myers_, Oct 05 2011

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Last modified May 30 04:19 EDT 2020. Contains 334711 sequences. (Running on oeis4.)