A056884 Number of asymmetric n-celled polyominoes without holes.

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

Offset

1,5

Links

John Mason, Table of n, a(n) for n = 1..40

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

Adjacent sequences: A056881 A056882 A056883 * A056885 A056886 A056887

Keyword

nonn

Author

N. J. A. Sloane, Sep 03 2000

Extensions

a(27)-a(32) from John Mason, Oct 11 2022

Status

approved