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%I #11 May 23 2022 14:15:52
%S 1,3,19,104,719,5123,37936,286606,2202201,17119423,134401246,
%T 1063570767,8473332319
%N Number of 1-sided triangular polyedges with n cells.
%H Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Polyedge.html">Polyedge</a>
%Y Cf. A151540, A151541, A159867.
%K nonn,hard,more
%O 1,2
%A _Ed Pegg Jr_, May 13 2009
%E a(9) and a(10) from _Joseph Myers_, Oct 05 2011
%E a(11)-a(13) from _Aaron N. Siegel_, May 23 2022
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