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A159867 Number of 2-sided n-triangular polyedges. 3
1, 3, 12, 60, 375, 2613, 19074, 143660, 1101860, 8562292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyedge

CROSSREFS

Cf. A151539, A151540, A151541.

Sequence in context: A105752 A177138 A053532 * A082278 A078162 A211774

Adjacent sequences:  A159864 A159865 A159866 * A159868 A159869 A159870

KEYWORD

nonn,hard,more

AUTHOR

Eric W. Weisstein, Apr 24 2009

EXTENSIONS

a(9) and a(10) from Joseph Myers, Oct 05 2011

STATUS

approved

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Last modified March 25 11:34 EDT 2017. Contains 284076 sequences.