a(n) = n*12^n + 1.

Terms

a(0) =1a(1) =13a(2) =289a(3) =5185a(4) =82945a(5) =1244161a(6) =17915905a(7) =250822657a(8) =3439853569a(9) =46438023169a(10) =619173642241