Number of standardized 4-connected side polyominoes of inner site-perimeter n.
A216821
Number of standardized 4-connected side polyominoes of inner site-perimeter n.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =5a(4) =13a(5) =54a(6) =182a(7) =782a(8) =3080a(9) =13250
External references
- oeis: A216821