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A056884 Number of asymmetric n-celled polyominoes without holes. 0
0, 0, 0, 1, 5, 20, 84, 311, 1165, 4276, 15802, 58280, 216070, 803116, 2997360, 11221443, 42147842, 158749808, 599513836, 2269390757, 8609258335, 32725209938, 124621150623, 475367241264, 1816100804241, 6948222137523 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..26.

Tomás Oliveira e Silva, Enumeration of polyominoes

CROSSREFS

Sequence in context: A301946 A292760 A270322 * A006749 A002213 A099949

Adjacent sequences:  A056881 A056882 A056883 * A056885 A056886 A056887

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 03 2000

STATUS

approved

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Last modified September 21 00:17 EDT 2019. Contains 327252 sequences. (Running on oeis4.)