Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 2.

A244703

Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 2.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =4a(4) =9a(5) =13a(6) =26a(7) =42a(8) =81a(9) =138a(10) =262a(11) =467a(12) =885a(13) =1620a(14) =3076a(15) =5743a(16) =10953a(17) =20721a(18) =39714a(19) =75873a(20) =146139a(21) =281259a(22) =544230a(23) =1053552a(24) =2047147a(25) =3981790a(26) =7766018a(27) =15165195a(28) =29676887a(29) =58148087

External references