a(n) = 2*n^2 + 6*n + 2.

Terms

a(0) =2a(1) =10a(2) =22a(3) =38a(4) =58a(5) =82a(6) =110a(7) =142a(8) =178a(9) =218a(10) =262a(11) =310a(12) =362a(13) =418a(14) =478a(15) =542a(16) =610a(17) =682a(18) =758a(19) =838a(20) =922a(21) =1010a(22) =1102a(23) =1198a(24) =1298a(25) =1402a(26) =1510a(27) =1622a(28) =1738a(29) =1858