Number of rooted bicolored trees on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node.
A339838
Number of rooted bicolored trees on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =27a(5) =75a(6) =221a(7) =662a(8) =2042a(9) =6402a(10) =20407a(11) =65828a(12) =214720a(13) =706600a(14) =2343767a(15) =7826752a(16) =26293468a(17) =88796471a(18) =301290197a(19) =1026595232a(20) =3511246069a(21) =12050780294a(22) =41488523002a(23) =143246116231a(24) =495881545520
External references
- oeis: A339838