a(n) = 103680000*n^2 - 46108800*n + 5126401.

Terms

a(0) =62697601a(1) =327628801a(2) =799920001a(3) =1479571201a(4) =2366582401a(5) =3460953601a(6) =4762684801a(7) =6271776001a(8) =7988227201a(9) =9912038401a(10) =12043209601a(11) =14381740801a(12) =16927632001a(13) =19680883201a(14) =22641494401a(15) =25809465601a(16) =29184796801a(17) =32767488001