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Search: id:A006762
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| A006762 |
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Number of fixed polyominoes with n cells.
(Formerly M3534)
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+0
2
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| 0, 0, 4, 17, 61, 214, 758, 2723, 9908, 36444, 135266, 505859, 1903888, 7204872, 27394664, 104592935, 400795842
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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This sequence counts only polyominoes that are strictly 2-dimensional - it excludes those where all the squares are in a single line. Thus for n>1, a(n) = A001168(n) - 2. - Franklin T. Adams-Watters, Jul 29 2007
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
W. F. Lunnon, Counting multidimensional polyominoes. Computer Journal 18 (1975), no. 4, pp. 366-367.
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CROSSREFS
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Cf. A001168.
Sequence in context: A027075 A034331 A107278 this_sequence A122231 A119916 A005784
Adjacent sequences: A006759 A006760 A006761 this_sequence A006763 A006764 A006765
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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