Sum of the divisors of 6^n+1.

Terms

a(0) =3a(1) =8a(2) =38a(3) =256a(4) =1298a(5) =9792a(6) =52136a(7) =338580a(8) =1778436a(9) =11889152a(10) =62367272a(11) =414625216a(12) =2178461956a(13) =15224775552a(14) =80673299432a(15) =611106029568