Number of rooted unlabeled trees on n nodes where each node has at most 9 children.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =20a(7) =48a(8) =115a(9) =286a(10) =719a(11) =1841a(12) =4763a(13) =12477a(14) =32947a(15) =87735a(16) =235162a(17) =634212a(18) =1719325a(19) =4683368a(20) =12810871a(21) =35177357a(22) =96926335a(23) =267909285a(24) =742641309a(25) =2064029034a(26) =5750500663a(27) =16057186086a(28) =44929879114a(29) =125962026154