a(n) = ((n-th prime)^6-(n-th prime)^5)/2.

Terms

a(0) =16a(1) =243a(2) =6250a(3) =50421a(4) =805255a(5) =2227758a(6) =11358856a(7) =22284891a(8) =70799773a(9) =287156086a(10) =429437265a(11) =1248191226a(12) =2317124020a(13) =3087177303a(14) =5274935161a(15) =10873082818a(16) =20732804671a(17) =25337889030a(18) =44554128531a(19) =63148027285a(20) =74630577348