a(n) = 2*prime(n)^2.

Terms

a(0) =8a(1) =18a(2) =50a(3) =98a(4) =242a(5) =338a(6) =578a(7) =722a(8) =1058a(9) =1682a(10) =1922a(11) =2738a(12) =3362a(13) =3698a(14) =4418a(15) =5618a(16) =6962a(17) =7442a(18) =8978a(19) =10082a(20) =10658a(21) =12482a(22) =13778a(23) =15842a(24) =18818a(25) =20402a(26) =21218a(27) =22898a(28) =23762a(29) =25538