Sum over all complete compositions of n of the element multiset size.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =13a(5) =30a(6) =73a(7) =157a(8) =345a(9) =743a(10) =1650a(11) =3517a(12) =7593a(13) =16120a(14) =34294a(15) =72683a(16) =153475a(17) =323293a(18) =679231a(19) =1423721a(20) =2977692a(21) =6218395a(22) =12959249a(23) =26970243a(24) =56037071a(25) =116280086a(26) =240953162a(27) =498719275a(28) =1031029386a(29) =2129266321