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

Author

N. J. A. Sloane, Sep 03 2000

Keywords

• nonn

Links

• John Mason, Table of n, a(n) for n = 1..40
• Tomás Oliveira e Silva, Enumeration of polyominoes

Crossrefs

Cf. A000104, A006749 (with holes allowed).

Formula

a(n) = A000104(n) - (A056879(n) + A056881(n) + A056883(n) + A056880(n) + A056882(n) + A357647(n) + A357648(n))

Extensions

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