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A057423 Diagonally symmetric n-celled polyominoes with 1 hole. 0
1, 0, 5, 4, 20, 18, 79, 84, 304, 332, 1149, 1309, 4312, 5005, 16136, 19049, 60347, 71979, 225867, 271781, 846667, 1025315 (list; graph; refs; listen; history; internal format)
OFFSET

7,3

LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A133167 A133173 A070374 * A204930 A167636 A180137

Adjacent sequences:  A057420 A057421 A057422 * A057424 A057425 A057426

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000

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Last modified February 15 20:03 EST 2012. Contains 205852 sequences.