A354864 a(n) is the number of free equable polyominoes of size 2n and perimeter 2n.

1, 6, 59, 581, 4812, 36666, 261515, 1802151, 12116488

Offset

8,2

Links

Table of n, a(n) for n=8..16.

Example

a(8) is 1 because of the 4 X 4 square polyomino, which has both size and perimeter equal to 16.

Crossrefs

Sequence in context: A156147 A024269 A224757 * A114501 A369513 A256035

Adjacent sequences: A354861 A354862 A354863 * A354865 A354866 A354867

Keyword

nonn,more

Author

John Mason, Jun 09 2022

Extensions

a(13)-a(16) from John Mason, Sep 08 2022

Status

approved