Number of free triangular n-polyplets (triangular polyominoes connected at edges or corners), where turning over is allowed and holes are allowed.
A239658
Number of free triangular n-polyplets (triangular polyominoes connected at edges or corners), where turning over is allowed and holes are allowed.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =75a(5) =528a(6) =4584a(7) =40609a(8) =373981a(9) =3493723a(10) =33079702a(11) =316109657a(12) =3044648053
External references
- oeis: A239658