A356975 a(n) is the number of n-celled pseudo-polyominoes with holes.

0, 0, 0, 1, 3, 28, 199, 1603, 12234, 93270, 697641, 5167477, 37913465

Offset

1,5

Links

Table of n, a(n) for n=1..13.

Example

a(4)=1 because of:
   O
  O O
   O
a(5)=3 because of:
   O    O     O
  O O  O OO  O O
  OO    O     O O

Crossrefs

Cf. A030222, A001419.

Sequence in context: A160872 A081019 A241455 * A278183 A091120 A045737

Adjacent sequences: A356972 A356973 A356974 * A356976 A356977 A356978

Keyword

nonn,hard,more

Author

John Mason, Sep 07 2022

Status

approved