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A057418 Number of n-celled polyominoes with 1 hole. 6
1, 6, 37, 195, 975, 4622, 21128, 94109, 410820, 1766591, 7506179, 31596240, 131991619, 547992183, 2263477612, 9309386178, 38150082057, 155859235424, 635067478628, 2581737704039 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

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

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A056338 A056328 A156185 * A001419 A081152 A244618

Adjacent sequences:  A057415 A057416 A057417 * A057419 A057420 A057421

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 05 2000

STATUS

approved

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Last modified October 20 20:18 EDT 2019. Contains 328273 sequences. (Running on oeis4.)