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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =8a(7) =18a(8) =38a(9) =76a(10) =144a(11) =266a(12) =476a(13) =841a(14) =1452a(15) =2482a(16) =4179a(17) =6978a(18) =11515a(19) =18876a(20) =30642a(21) =49435a(22) =79116a(23) =125850a(24) =198771a(25) =312136a(26) =486940a(27) =755359a(28) =1164573a(29) =1785513