A359522 Number of free, holey, treelike polyominoes of n cells.

0, 0, 0, 0, 0, 0, 1, 5, 32, 144, 662, 2835, 11955, 49083, 199029, 796867, 3163384, 12463807

Offset

1,8

Links

Table of n, a(n) for n=1..18.

Example

a(7) = 1 because of the holey heptomino.

Crossrefs

Cf. A000105, A001419, A131482.

Sequence in context: A077207 A319790 A273623 * A001589 A271903 A177467

Adjacent sequences: A359519 A359520 A359521 * A359523 A359524 A359525

Keyword

nonn,more

Author

John Mason, Jan 04 2023

Status

approved