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Search: id:A130616
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| A130616 |
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Number of triangular polyominoes (or polyiamonds) with perimeter at most n. |
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+0
1
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OFFSET
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0,4
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COMMENT
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Partial sums of A057729 - Number of triangular polyominoes (or polyiamonds) with perimeter n. a(n+2) >= A130867(n) - Triangular polyominoes (or polyiamonds) with n cells at most.
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CROSSREFS
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Cf. A131481: a(n) is the number of n-cell polyiamonds (triangular polyominoes) with perimeter n+2.
Sequence in context: A099163 A000676 A032173 this_sequence A089324 A111759 A047749
Adjacent sequences: A130613 A130614 A130615 this_sequence A130617 A130618 A130619
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KEYWORD
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hard,more,nonn
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AUTHOR
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Tanya Khovanova (tanyakh(AT)yahoo.com), Aug 10 2007
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