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A057425 Number of rotationally symmetric 2n-celled polyominoes with 1 hole. +0
1
1, 7, 42, 193, 853, 3553, 14564, 58636, 234523 (list; graph; listen)
OFFSET

5,2
LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A102532 A044109 A110451 this_sequence A073376 A094429 A022731

Adjacent sequences: A057422 A057423 A057424 this_sequence A057426 A057427 A057428

KEYWORD

nonn

AUTHOR

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

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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