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Search: id:A006749
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| A006749 |
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Number of asymmetric polyominoes with n cells.
(Formerly M3906)
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+0
8
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| 1, 5, 20, 84, 316, 1196, 4461, 16750, 62878, 237394, 899265, 3422111, 13069026, 50091095, 192583152, 742560511, 2870523142, 11122817672, 43191285751, 168046076423, 654997492842, 2557223459805, 9999080270766, 39152997087077, 153511067364760
(list; graph; listen)
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OFFSET
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4,2
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REFERENCES
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A. R. Conway and A. J. Guttmann, On two-dimensional percolation, J. Phys. A: Math. Gen. 28(1995) 891-904.
D. H. Redelmeier, Counting polyominoes: yet another attack, Discrete Math., 36 (1981), 191-203.
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LINKS
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Tomas Oliveira e Silva, Enumeration of polyominoes
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CROSSREFS
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Cf. A000105, A001168, A006746, A056877, A006748, A056878, A006747, A006749, A006884, A006885, A006877, A006878, A033492.
Adjacent sequences: A006746 A006747 A006748 this_sequence A006750 A006751 A006752
Sequence in context: A022021 A030520 A056884 this_sequence A002213 A099949 A006231
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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Extended to n=28 by Tomas Oliveira e Silva.
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