Array read by antidiagonals: T(n,k) is the number of noncrossing k-gonal cacti with n polygons up to rotation.
A361236
Array read by antidiagonals: T(n,k) is the number of noncrossing k-gonal cacti with n polygons up to rotation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =1a(13) =4a(14) =1a(15) =1a(16) =1a(17) =1a(18) =5a(19) =11a(20) =1a(21) =1a(22) =1a(23) =1a(24) =8a(25) =33a(26) =49a(27) =1a(28) =1a(29) =1
External references
- oeis: A361236