Number A(n,k) of rooted identity trees with n nodes and k-colored non-root nodes; square array A(n,k), n>=0, k>=0, read by antidiagonals.
A255517
Number A(n,k) of rooted identity trees with n nodes and k-colored non-root nodes; square array A(n,k), n>=0, k>=0, read by antidiagonals.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =0a(7) =1a(8) =1a(9) =0a(10) =0a(11) =1a(12) =2a(13) =1a(14) =0a(15) =0a(16) =1a(17) =3a(18) =5a(19) =2a(20) =0a(21) =0a(22) =1a(23) =4a(24) =12a(25) =18a(26) =3a(27) =0a(28) =0a(29) =1
External references
- oeis: A255517