Number of forests of exactly n (unlabeled) ordered rooted trees with a total of 2n non-root nodes.

A292668

Number of forests of exactly n (unlabeled) ordered rooted trees with a total of 2n non-root nodes.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =28a(4) =105a(5) =384a(6) =1442a(7) =5388a(8) =20317a(9) =76712a(10) =290790a(11) =1104538a(12) =4205909a(13) =16044994a(14) =61322356a(15) =234739140a(16) =899911685a(17) =3454630372a(18) =13278582906a(19) =51098682962a(20) =196853475135a(21) =759139115962

External references