Number of bicolored trees on n unlabeled nodes such that every white node is adjacent to a black node.
A339834
Number of bicolored trees on n unlabeled nodes such that every white node is adjacent to a black node.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =29a(6) =91a(7) =299a(8) =1057a(9) =3884a(10) =14883a(11) =58508a(12) =235771a(13) =967790a(14) =4037807a(15) =17074475a(16) =73058753a(17) =315803342a(18) =1377445726a(19) =6056134719a(20) =26817483095a(21) =119516734167a(22) =535751271345
External references
- oeis: A339834