1482401250n^2 - 2134548900n + 768398401.

Terms

a(0) =116250751a(1) =2428905601a(2) =7706362951a(3) =15948622801a(4) =27155685151a(5) =41327550001a(6) =58464217351a(7) =78565687201a(8) =101631959551a(9) =127663034401a(10) =156658911751a(11) =188619591601a(12) =223545073951a(13) =261435358801a(14) =302290446151a(15) =346110336001a(16) =392895028351a(17) =442644523201a(18) =495358820551