a(0) = 0; a(n) = 6^(n-1) + (1/n) * Sum_{k=1..n-1} binomial(n,k)^2 * 6^(k-1) * (n-k) * a(n-k).
A333985
a(0) = 0; a(n) = 6^(n-1) + (1/n) * Sum_{k=1..n-1} binomial(n,k)^2 * 6^(k-1) * (n-k) * a(n-k).
Terms
- a(0) =0a(1) =1a(2) =8a(3) =102a(4) =2448a(5) =99576a(6) =6070032a(7) =517803840a(8) =58901955840
External references
- oeis: A333985