a(n) = 784*n^2 + 28.

Terms

a(0) =28a(1) =812a(2) =3164a(3) =7084a(4) =12572a(5) =19628a(6) =28252a(7) =38444a(8) =50204a(9) =63532a(10) =78428a(11) =94892a(12) =112924a(13) =132524a(14) =153692a(15) =176428a(16) =200732a(17) =226604a(18) =254044a(19) =283052a(20) =313628a(21) =345772a(22) =379484a(23) =414764a(24) =451612a(25) =490028a(26) =530012a(27) =571564a(28) =614684a(29) =659372