a(n) = 2401*n^2 - 3822*n + 1520.

Terms

a(0) =99a(1) =3480a(2) =11663a(3) =24648a(4) =42435a(5) =65024a(6) =92415a(7) =124608a(8) =161603a(9) =203400a(10) =249999a(11) =301400a(12) =357603a(13) =418608a(14) =484415a(15) =555024a(16) =630435a(17) =710648a(18) =795663a(19) =885480a(20) =980099a(21) =1079520a(22) =1183743a(23) =1292768a(24) =1406595a(25) =1525224a(26) =1648655a(27) =1776888a(28) =1909923a(29) =2047760