Number A(n,k) of hybrid k-ary trees with n internal nodes; square array A(n,k), n>=0, k>=1, read by antidiagonals.
A245049
Number A(n,k) of hybrid k-ary trees with n internal nodes; square array A(n,k), n>=0, k>=1, read by antidiagonals.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =2a(5) =3a(6) =1a(7) =2a(8) =7a(9) =5a(10) =1a(11) =2a(12) =11a(13) =31a(14) =8a(15) =1a(16) =2a(17) =15a(18) =81a(19) =154a(20) =13a(21) =1a(22) =2a(23) =19a(24) =155a(25) =684a(26) =820a(27) =21a(28) =1a(29) =2
External references
- oeis: A245049