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A056884 Number of asymmetric n-celled polyominoes without holes. 2
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, 26618662003342, 102102765921611, 392095326233619, 1507357249572269, 5800716924062537, 22344021033377558 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
Tomás Oliveira e Silva, Enumeration of polyominoes
FORMULA
a(n) = A000104(n) - (A056879(n) + A056881(n) + A056883(n) + A056880(n) + A056882(n) + A357647(n) + A357648(n))
CROSSREFS
Cf. A000104, A006749 (with holes allowed).
Sequence in context: A301946 A292760 A270322 * A006749 A002213 A099949
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 03 2000
EXTENSIONS
a(27)-a(32) from John Mason, Oct 11 2022
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)