Triangle read by rows: T(n,k) is the number of lone-child-avoiding rooted trees with n leaves of exactly k colors.

A319376

Triangle read by rows: T(n,k) is the number of lone-child-avoiding rooted trees with n leaves of exactly k colors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =4a(6) =5a(7) =30a(8) =51a(9) =26a(10) =12a(11) =146a(12) =474a(13) =576a(14) =236a(15) =33a(16) =719a(17) =3950a(18) =8572a(19) =8060a(20) =2752a(21) =90a(22) =3590a(23) =31464a(24) =108416a(25) =175380a(26) =134136a(27) =39208a(28) =261a(29) =18283

External references