a(1) = 1, a(n) = Sum_{k=1..n-1} ((12^k - 1)/11)*a(k).
A015515
a(1) = 1, a(n) = Sum_{k=1..n-1} ((12^k - 1)/11)*a(k).
Terms
- a(0) =1a(1) =1a(2) =14a(3) =2212a(4) =4171832a(5) =94375183504
External references
- oeis: A015515
A015515
a(1) = 1, a(n) = Sum_{k=1..n-1} ((12^k - 1)/11)*a(k).