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

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

Offset

1,2

Comments

Also number of unrooted self-avoiding walks of n steps on hexagonal [ =triangular ] lattice. - Hugo Pfoertner, Jun 23 2018

Links

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

Crossrefs

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

Keyword

nonn,walk,hard,more

Author

Ed Pegg Jr, May 13 2009

Extensions

a(9)-a(13) from Joseph Myers, Oct 05 2011

Status

approved