Number of 4-ary rooted trees with n nodes and height exactly 7.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =6a(9) =26a(10) =94a(11) =302a(12) =900a(13) =2546a(14) =6931a(15) =18341a(16) =47474a(17) =120750a(18) =302741a(19) =750050a(20) =1839421a(21) =4471759a(22) =10787891a(23) =25849612a(24) =61564934a(25) =145828769a(26) =343713516a(27) =806462038a(28) =1884353462a(29) =4386038531