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Search: id:A131487
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| A131487 |
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a(n) is the number of polyominoes with n edges. |
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+0
1
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| 0, 0, 0, 1, 0, 0, 1, 0, 0, 2, 0, 1, 4, 0, 1, 11, 1, 7, 27, 4, 21, 85
(list; graph; listen)
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OFFSET
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1,10
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COMMENT
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n-celled polyomino with perimeter p has (4n+p)/2 edges. The maximum number of edges in an n-celled polyomino is 3n+1.
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LINKS
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Isoperimetrical Polyominoes at Poly Pages
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CROSSREFS
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Cf. A000105: Number of polyominoes (or square animals) with n cells. A057730: Number of polyominoes (A000105) with perimeter 2n. A131482: a(n) is the number of n-celled polyominoes with perimeter 2n+2.
Sequence in context: A099089 A121298 A121462 this_sequence A039991 A081265 A108643
Adjacent sequences: A131484 A131485 A131486 this_sequence A131488 A131489 A131490
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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), Jul 28 2007
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