Four-fold convolution of primes with themselves.

Terms

a(0) =16a(1) =96a(2) =376a(3) =1160a(4) =3121a(5) =7532a(6) =16754a(7) =34796a(8) =68339a(9) =127952a(10) =229956a(11) =398688a(12) =669781a(13) =1094076a(14) =1742710a(15) =2713604a(16) =4139111a(17) =6195712a(18) =9115304a(19) =13199072a(20) =18833449a(21) =26509260a(22) =36843322a(23) =50603884a(24) =68740107a(25) =92414192a(26) =123039628a(27) =162323200a(28) =212312453a(29) =275448380