a(n) = 103680000*n^2 - 194428800*n + 91152001.

Terms

a(0) =403201a(1) =117014401a(2) =440985601a(3) =972316801a(4) =1711008001a(5) =2657059201a(6) =3810470401a(7) =5171241601a(8) =6739372801a(9) =8514864001a(10) =10497715201a(11) =12687926401a(12) =15085497601a(13) =17690428801a(14) =20502720001a(15) =23522371201a(16) =26749382401a(17) =30183753601