Number of rooted bicolored trees on n unlabeled nodes such that every white node is adjacent to a black node.

A339835

Number of rooted bicolored trees on n unlabeled nodes such that every white node is adjacent to a black node.

Terms

    a(0) =1a(1) =3a(2) =9a(3) =30a(4) =111a(5) =424a(6) =1705a(7) =7024a(8) =29692a(9) =127748a(10) =558219a(11) =2469403a(12) =11039992a(13) =49796803a(14) =226348740a(15) =1035750855a(16) =4767429667a(17) =22058219466a(18) =102534463563a(19) =478602668159

External references