a(n) = 2*n^2 + 12*n + 4.

Terms

a(0) =18a(1) =36a(2) =58a(3) =84a(4) =114a(5) =148a(6) =186a(7) =228a(8) =274a(9) =324a(10) =378a(11) =436a(12) =498a(13) =564a(14) =634a(15) =708a(16) =786a(17) =868a(18) =954a(19) =1044a(20) =1138a(21) =1236a(22) =1338a(23) =1444a(24) =1554a(25) =1668a(26) =1786a(27) =1908a(28) =2034a(29) =2164