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

5,2

LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A044109 A195320 A110451 * A073376 A094429 A022731

Adjacent sequences:  A057422 A057423 A057424 * A057426 A057427 A057428

KEYWORD

nonn

AUTHOR

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

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Last modified February 13 18:44 EST 2012. Contains 205535 sequences.