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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.

CROSSREFS

Sequence in context: A139769 A007839 A045625 this_sequence A038557 A011234 A128412

Adjacent sequences: A001930 A001931 A001932 this_sequence A001934 A001935 A001936

KEYWORD

hard,nonn

AUTHOR

njas

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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