a(n) = (prime(n)^5 - prime(n))/15.

Terms

a(0) =2a(1) =16a(2) =208a(3) =1120a(4) =10736a(5) =24752a(6) =94656a(7) =165072a(8) =429088a(9) =1367408a(10) =1908608a(11) =4622928a(12) =7723744a(13) =9800560a(14) =15289664a(15) =27879696a(16) =47661616a(17) =56306416a(18) =90008336a(19) =120281952a(20) =138204768a(21) =205137088a(22) =262602704a(23) =372270624a(24) =572489344a(25) =700673360a(26) =772849376