Sum of the divisors of 6^n-1.

Terms

a(0) =6a(1) =48a(2) =264a(3) =1824a(4) =9672a(5) =67584a(6) =335928a(7) =2367552a(8) =13031040a(9) =94708224a(10) =454285152a(11) =3523559424a(12) =15677418768a(13) =113738502240a(14) =599516366592