a(1)=1, a(n) = n*21^(n-1) + a(n-1).
A014938
a(1)=1, a(n) = n*21^(n-1) + a(n-1).
Terms
- a(0) =1a(1) =43a(2) =1366a(3) =38410a(4) =1010815a(5) =25515421a(6) =625878268a(7) =15034586596a(8) =355440320845
External references
- oeis: A014938
A014938
a(1)=1, a(n) = n*21^(n-1) + a(n-1).