Array read by antidiagonals: T(n,k) is the number of rooted unlabeled k-gonal cacti having n polygons.
A332648
Array read by antidiagonals: T(n,k) is the number of rooted unlabeled k-gonal cacti having n polygons.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =1a(10) =1a(11) =1a(12) =2a(13) =4a(14) =1a(15) =1a(16) =1a(17) =3a(18) =5a(19) =9a(20) =1a(21) =1a(22) =1a(23) =3a(24) =11a(25) =13a(26) =20a(27) =1a(28) =1a(29) =1
External references
- oeis: A332648