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A057425 Number of rotationally symmetric 2n-celled polyominoes with 1 hole. 0
1, 7, 42, 193, 853, 3553, 14564, 58636, 234523 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,2
LINKS
Table of n, a(n) for n=5..13.
Tomás Oliveira e Silva, Enumeration of polyominoes
CROSSREFS
Cf. A056883.
Sequence in context: A212144 A266387 A008526 * A248329 A073376 A094429
Adjacent sequences: A057422 A057423 A057424 * A057426 A057427 A057428
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 05 2000
STATUS
approved

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Last modified May 12 23:28 EDT 2024. Contains 372497 sequences. (Running on oeis4.)