Sum of the divisors of 8^n+1.

Terms

a(0) =3a(1) =13a(2) =84a(3) =800a(4) =4356a(5) =51792a(6) =351120a(7) =3100240a(8) =17041416a(9) =211053040a(10) =1494039792a(11) =12611914848a(12) =73234343952a(13) =794382536272