A159867 Number of 2-sided n-triangular polyedges.

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

Offset: 1

Author

Eric W. Weisstein, Apr 24 2009

Keywords

• nonn
• hard
• more

Links

• R. J. Mathar, OEIS A159867
• Ed Pegg, Jr., Illustrations of polyforms
• Eric Weisstein's World of Mathematics, Polyedge

Crossrefs

Cf. A151539, A151540, A151541.

Extensions

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

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