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A057424 Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole. +0
1
1, 1, 5, 7, 21, 30, 88, 116, 336 (list; graph; listen)
OFFSET

6,3
LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Adjacent sequences: A057421 A057422 A057423 this_sequence A057425 A057426 A057427

Sequence in context: A117321 A120035 A091154 this_sequence A027152 A076197 A002596

KEYWORD

nonn

AUTHOR

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

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

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