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A131487
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a(n) is the number of polyominoes with n edges.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,10
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COMMENTS
| 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
| Isoperimetrical Polyominoes at Poly Pages
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CROSSREFS
| 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 * A181670 A039991 A081265
Adjacent sequences: A131484 A131485 A131486 * A131488 A131489 A131490
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KEYWORD
| hard,more,nonn
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AUTHOR
| Tanya Khovanova (tanyakh(AT)yahoo.com), Jul 28 2007
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