A119532 Number of n-ominoes plus number of n-iamonds.

2, 2, 2, 3, 8, 16, 47, 132, 435, 1445, 5103, 18259, 66934, 247826, 928137, 3500559, 13290552, 50712016, 194358380, 747624825, 2885120934, 11164896416, 43313276948, 168400053019, 656028153120, 2560227845391, 10007858038797, 39178672900385, 153586295761270, 602842558581537, 2368994981198048

Offset: 0

Author

Jonathan Vos Post, May 28 2006

Keywords

• nonn

Comments

Number of polyominoes with n cells plus number of polyiamonds with n cells. Turning over is allowed; holes are allowed.

Crossrefs

Cf. A000105, A000577.

Formula

a(n) = A000105(n) + A000577(n).

Extensions

More terms from John Mason, Jan 08 2023