a(0) = 1 and a(n) = (1/n) * Sum_{k=1..n} 2^(n-k) * binomial(n,k) * binomial(n+(n-1)*k,k-1) for n > 0.
A336712
a(0) = 1 and a(n) = (1/n) * Sum_{k=1..n} 2^(n-k) * binomial(n,k) * binomial(n+(n-1)*k,k-1) for n > 0.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =30a(4) =364a(5) =6502a(6) =158034a(7) =4921112a(8) =187897728a(9) =8519286854a(10) =447829041358
External references
- oeis: A336712