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URL: https://oeis.org/A057419

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A057419
Number of fixed n-celled polyominoes with 1 hole.
2
4, 41, 272, 1516, 7688, 36726, 168528, 751742, 3284460, 14127796, 60040812, 252749460, 1055898224, 4383854044, 18107682684, 74474755264, 305200110920, 1246872556159, 5080537687912, 20653896398652, 83796690230556, 339383743192897
OFFSET
7,1
CROSSREFS
Cf. A057418 (free).
Sequence in context: A069631 A069616 A231653 * A389193 A089664 A121671
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 05 2000
EXTENSIONS
a(27)-a(28) using data from Tomás Oliveira e Silva's page added by Andrei Zabolotskii, Sep 15 2025
STATUS
approved