Coefficient of x^n in product (1+x)*Product_{j>=1} (1 + prime(j)*x^j).

Terms

a(0) =3a(1) =5a(2) =14a(3) =28a(4) =57a(5) =126a(6) =239a(7) =436a(8) =830a(9) =1616a(10) =2806a(11) =4975a(12) =8578a(13) =14914a(14) =26825a(15) =45148a(16) =73742a(17) =124446a(18) =205326a(19) =333878a(20) =560588a(21) =903857a(22) =1431876a(23) =2275324a(24) =3633808a(25) =5713071a(26) =9019922a(27) =14309452a(28) =22104630a(29) =34018220