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A057419 Number of fixed n-celled polyominoes with 1 hole. 0
4, 41, 272, 1516, 7688, 36726, 168528, 751742, 3284460, 14127796, 60040812, 252749460, 1055898224, 4383854044, 18107682684, 74474755264, 305200110920, 1246872556159, 5080537687912, 20653896398652 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

LINKS

Table of n, a(n) for n=7..26.

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A069631 A069616 A231653 * A089664 A121671 A089454

Adjacent sequences:  A057416 A057417 A057418 * A057420 A057421 A057422

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 05 2000

STATUS

approved

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Last modified April 11 15:49 EDT 2021. Contains 342886 sequences. (Running on oeis4.)