Number of unlabeled rooted identity trees with n non-binary nodes.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =5a(10) =8a(11) =14a(12) =23a(13) =40a(14) =69a(15) =122a(16) =215a(17) =382a(18) =679a(19) =1217a(20) =2185a(21) =3944a(22) =7136a(23) =12958a(24) =23578a(25) =43026a(26) =78673a(27) =144190a(28) =264755a(29) =487074