Number of 6-ary rooted trees with n nodes and height at most 4.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =15a(7) =29a(8) =52a(9) =95a(10) =168a(11) =297a(12) =513a(13) =887a(14) =1504a(15) =2543a(16) =4247a(17) =7054a(18) =11596a(19) =18964a(20) =30732a(21) =49529a(22) =79210a(23) =125944a(24) =198861a(25) =312224a(26) =487021a(27) =755435a(28) =1164641a(29) =1785574