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A057420
Axially symmetric n-celled polyominoes with 1 hole.
0
1, 3, 8, 25, 45, 137, 221, 650, 1006, 2857, 4370, 12050, 18417, 49516, 76037, 200184, 309411, 800440, 1245934, 3176482
OFFSET
9,2
CROSSREFS
Sequence in context: A328272 A220486 A180380 * A076049 A026970 A026980
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 05 2000
STATUS
approved