Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes or outdegrees larger than six.

A292212

Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes or outdegrees larger than six.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =5a(5) =12a(6) =33a(7) =89a(8) =258a(9) =756a(10) =2279a(11) =6957a(12) =21592a(13) =67689a(14) =214451a(15) =684850a(16) =2203384a(17) =7133042a(18) =23222003a(19) =75971636a(20) =249646198a(21) =823597534a(22) =2726859943a(23) =9057797752a(24) =30176758016a(25) =100810029178a(26) =337614951216

External references