A245660 Number of unitary polyominoes without holes with n cells. A unitary polyomino is a polyomino whose edges all have length 1.
1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 2, 1, 2, 4, 5, 4, 12, 13, 20, 29, 52, 67, 106, 173, 269, 375, 658, 991, 1512, 2425, 3896, 5902, 9454, 15146, 23601, 37050, 59908, 93777, 148151, 237228, 375893, 593773, 948623, 1508823, 2393035, 3812023, 6083290, 9666024, 15404085, 24592209
Offset: 1
Links
- John Mason, Counting unitary polyominoes without holes
- George Sicherman, Catalogue of Unitary Polyominoes
Crossrefs
Cf. A245620, number of unitary polyominoes with n cells.
Extensions
Added a(16)-a(20), George Sicherman, Jul 29 2014
a(21)-a(43) from John Mason, Apr 21 2023
a(44)-a(50) from John Mason, Apr 26 2023