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A057422 Axially symmetric (about axis 2) 2n-celled polyominoes with 1 hole. +0
1
0, 2, 4, 12, 24, 57, 112, 244, 483, 998, 1979 (list; graph; listen)
OFFSET

4,2
LINKS

Tomas Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A133411 A004645 A045687 this_sequence A036045 A100538 A135139

Adjacent sequences: A057419 A057420 A057421 this_sequence A057423 A057424 A057425

KEYWORD

nonn

AUTHOR

njas, Sep 05 2000

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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