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A130867
Triangular polyominoes (or polyiamonds) with n cells at most (turning over is allowed, holes are allowed, must be connected along edges).
1
1, 2, 3, 6, 10, 22, 46, 112, 272, 720, 1906, 5240, 14475, 40641, 114624, 325921, 930028, 2666356, 7666949, 22115933, 63951671, 185370931, 538416222, 1566868939, 4567669566, 13336886288, 38998848186, 114194014853
OFFSET
1,2
CROSSREFS
Partial sums of A000577.
Sequence in context: A052817 A156803 A002992 * A218210 A122381 A141034
KEYWORD
nonn
AUTHOR
Tanya Khovanova, Jul 23 2007
STATUS
approved