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A001933
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Chessboard polyominoes with n squares.
(Formerly M0171 N0066)
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2
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2, 1, 4, 7, 24, 62, 216, 710, 2570, 9215, 34146, 126853, 477182, 1802673, 6853152, 26153758, 100215818
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| W. F. Lunnon, personal communication.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Joseph Myers, Chessboard polyominoes
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CROSSREFS
| Cf. A001071, A121198.
Sequence in context: A184345 A045625 A146004 * A038557 A011234 A161381
Adjacent sequences: A001930 A001931 A001932 * A001934 A001935 A001936
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KEYWORD
| hard,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| a(14)-a(17) from Joseph Myers (jsm(AT)polyomino.org.uk), Oct 01 2011
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