a(n) = 784*n^2 - 2*n.

Terms

a(0) =782a(1) =3132a(2) =7050a(3) =12536a(4) =19590a(5) =28212a(6) =38402a(7) =50160a(8) =63486a(9) =78380a(10) =94842a(11) =112872a(12) =132470a(13) =153636a(14) =176370a(15) =200672a(16) =226542a(17) =253980a(18) =282986a(19) =313560a(20) =345702a(21) =379412a(22) =414690a(23) =451536a(24) =489950a(25) =529932a(26) =571482a(27) =614600a(28) =659286a(29) =705540