a(n) = 5000*n^2 + 200*n + 1.

Terms

a(0) =5201a(1) =20401a(2) =45601a(3) =80801a(4) =126001a(5) =181201a(6) =246401a(7) =321601a(8) =406801a(9) =502001a(10) =607201a(11) =722401a(12) =847601a(13) =982801a(14) =1128001a(15) =1283201a(16) =1448401a(17) =1623601a(18) =1808801a(19) =2004001a(20) =2209201a(21) =2424401a(22) =2649601a(23) =2884801a(24) =3130001a(25) =3385201a(26) =3650401