A159867 Number of 2-sided n-triangular polyedges.

1, 3, 12, 60, 375, 2613, 19074, 143660, 1101860, 8562292, 67206242, 531804577, 4236708679

Offset

1,2

Links

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

R. J. Mathar, OEIS A159867

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyedge

Crossrefs

Cf. A151539, A151540, A151541.

Sequence in context: A177138 A053532 A357594 * A082278 A078162 A348002

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

a(11)-a(13) from Aaron N. Siegel, May 22 2022

Status

approved