a(n) = (prime(n)-3)*(prime(n)-5)*(prime(n)-7)/48.

Terms

a(0) =0a(1) =0a(2) =0a(3) =4a(4) =10a(5) =35a(6) =56a(7) =120a(8) =286a(9) =364a(10) =680a(11) =969a(12) =1140a(13) =1540a(14) =2300a(15) =3276a(16) =3654a(17) =4960a(18) =5984a(19) =6545a(20) =8436a(21) =9880a(22) =12341a(23) =16215a(24) =18424a(25) =19600a(26) =22100a(27) =23426a(28) =26235a(29) =37820