|
%I #2 Mar 30 2012 18:49:09
%S 0,0,0,0,0,1,1,4,11,39,120,403,1254,4000,12475,39030
%N Number of n-celled polyiamonds with perimeter < n+2.
%C These are n-cell polyiamonds with the perimeter less than the maximum possible one.
%C If we associate a graph to a polyiamond with vertices representing cells and edges representing two cells with a common edge, then this sequence enumerates polyiamonds whose corresponding graphs have cycles.
%F A000577(n) - A131481(n)
%K hard,more,nonn
%O 1,8
%A _Tanya Khovanova_, Mar 03 2008
|
