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A001933 Chessboard polyominoes with n squares.
(Formerly M0171 N0066)
+0
1
2, 1, 4, 7, 24, 62, 216, 710, 2570, 9215, 34146, 126853, 477182 (list; graph; listen)
OFFSET

1,1

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).

CROSSREFS

Adjacent sequences: A001930 A001931 A001932 this_sequence A001934 A001935 A001936

Sequence in context: A007839 A045625 A146004 this_sequence A038557 A011234 A128412

KEYWORD

hard,nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.


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