a(n) = 103680000*n^2 - 28800*n + 1.

Terms

a(0) =103651201a(1) =414662401a(2) =933033601a(3) =1658764801a(4) =2591856001a(5) =3732307201a(6) =5080118401a(7) =6635289601a(8) =8397820801a(9) =10367712001a(10) =12544963201a(11) =14929574401a(12) =17521545601a(13) =20320876801a(14) =23327568001a(15) =26541619201a(16) =29963030401a(17) =33591801601