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A151540 Number of 1-sided triangular strip polyedges with n cells. 4
1, 3, 14, 54, 239, 1007, 4375, 18728, 80572, 344651, 1473402, 6280556, 26732173 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyedge

CROSSREFS

Cf. A151539, A151541, A159867.

Sequence in context: A179610 A166680 A104191 * A226466 A026544 A026527

Adjacent sequences:  A151537 A151538 A151539 * A151541 A151542 A151543

KEYWORD

nonn,hard,more

AUTHOR

Ed Pegg Jr, May 13 2009

EXTENSIONS

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

STATUS

approved

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Last modified May 25 14:13 EDT 2017. Contains 287038 sequences.