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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

CROSSREFS

Partial sums of A000577.

Sequence in context: A052817 A156803 A002992 * A218210 A122381 A141034

Adjacent sequences:  A130864 A130865 A130866 * A130868 A130869 A130870

KEYWORD

nonn

AUTHOR

Tanya Khovanova, Jul 23 2007

STATUS

approved

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Last modified June 28 15:16 EDT 2017. Contains 288838 sequences.