Number of ternary 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) =15a(8) =27a(9) =43a(10) =67a(11) =97a(12) =136a(13) =183a(14) =239a(15) =300a(16) =369a(17) =432a(18) =498a(19) =551a(20) =594a(21) =614a(22) =624a(23) =601a(24) =570a(25) =514a(26) =453a(27) =378a(28) =312a(29) =238