A359523 Number of free polyiamonds of n cells with multiply-connected interiors.

1, 2, 12, 51, 217, 846, 3211

Offset

12,2

Links

Table of n, a(n) for n=12..18.

Formula

a(n) = A070764(n) - A359524(n).

Crossrefs

Cf. A000577, A070764, A359519, A359524.

Sequence in context: A012695 A012382 A198008 * A323851 A054667 A009537

Adjacent sequences: A359520 A359521 A359522 * A359524 A359525 A359526

Keyword

nonn,more

Author

John Mason, Jan 05 2023

Status

approved