(Prime(prime(n))^2-1)/24.

Terms

a(0) =1a(1) =5a(2) =12a(3) =40a(4) =70a(5) =145a(6) =187a(7) =287a(8) =495a(9) =672a(10) =1027a(11) =1335a(12) =1520a(13) =1855a(14) =2420a(15) =3197a(16) =3337a(17) =4565a(18) =5192a(19) =5612a(20) =6700a(21) =7740a(22) =8855a(23) =10795a(24) =12467a(25) =13207a(26) =14357a(27) =14950a(28) =15862a(29) =20945