Number of series-reduced planted trees with n+9 nodes and 4 internal nodes.

Terms

a(0) =0a(1) =3a(2) =12a(3) =29a(4) =57a(5) =99a(6) =157a(7) =234a(8) =333a(9) =456a(10) =606a(11) =786a(12) =998a(13) =1245a(14) =1530a(15) =1855a(16) =2223a(17) =2637a(18) =3099a(19) =3612a(20) =4179a(21) =4802a(22) =5484a(23) =6228a(24) =7036a(25) =7911a(26) =8856a(27) =9873a(28) =10965a(29) =12135