a(n) = 100*n^2 - 49*n + 6.

Terms

a(0) =57a(1) =308a(2) =759a(3) =1410a(4) =2261a(5) =3312a(6) =4563a(7) =6014a(8) =7665a(9) =9516a(10) =11567a(11) =13818a(12) =16269a(13) =18920a(14) =21771a(15) =24822a(16) =28073a(17) =31524a(18) =35175a(19) =39026a(20) =43077a(21) =47328a(22) =51779a(23) =56430a(24) =61281a(25) =66332a(26) =71583a(27) =77034a(28) =82685a(29) =88536