a(n) = 196*n^2 - n.

Terms

a(0) =195a(1) =782a(2) =1761a(3) =3132a(4) =4895a(5) =7050a(6) =9597a(7) =12536a(8) =15867a(9) =19590a(10) =23705a(11) =28212a(12) =33111a(13) =38402a(14) =44085a(15) =50160a(16) =56627a(17) =63486a(18) =70737a(19) =78380a(20) =86415a(21) =94842a(22) =103661a(23) =112872a(24) =122475a(25) =132470a(26) =142857a(27) =153636a(28) =164807a(29) =176370