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A196993
Number of fixed polypons with n cells (division into triangles is significant).
0
6, 9, 14, 24, 42, 77, 144, 276, 538, 1065, 2136, 4321, 8790, 17967, 36890, 76050, 157380, 326824, 680880, 1422570, 2979572, 6254175, 13153242, 27712901, 58487796, 123632910
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Polypon
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Joseph Myers, Oct 08 2011
STATUS
approved