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Triangular polyominoes (or polyiamonds) with n cells at most (turning over is allowed, holes are allowed, must be connected along edges).
1

%I #2 Mar 30 2012 18:49:09

%S 1,2,3,6,10,22,46,112,272,720,1906,5240,14475,40641,114624,325921,

%T 930028,2666356,7666949,22115933,63951671,185370931,538416222,

%U 1566868939,4567669566,13336886288,38998848186,114194014853

%N Triangular polyominoes (or polyiamonds) with n cells at most (turning over is allowed, holes are allowed, must be connected along edges).

%Y Partial sums of A000577.

%K nonn

%O 1,2

%A _Tanya Khovanova_, Jul 23 2007