Number of terms in 5th derivative of a function composed with itself n times.

Terms

a(0) =1a(1) =7a(2) =23a(3) =55a(4) =110a(5) =196a(6) =322a(7) =498a(8) =735a(9) =1045a(10) =1441a(11) =1937a(12) =2548a(13) =3290a(14) =4180a(15) =5236a(16) =6477a(17) =7923a(18) =9595a(19) =11515a(20) =13706a(21) =16192a(22) =18998a(23) =22150a(24) =25675a(25) =29601a(26) =33957a(27) =38773a(28) =44080a(29) =49910