a(0) = 1; a(n) = n * a(n-1) + (1/n) * Sum_{k=3..n} (binomial(n,k) * k!)^2 * a(n-k) / k.
A346372
a(0) = 1; a(n) = n * a(n-1) + (1/n) * Sum_{k=3..n} (binomial(n,k) * k!)^2 * a(n-k) / k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =10a(4) =124a(5) =2396a(6) =64856a(7) =2452472a(8) =124483360a(9) =8146185504a(10) =668645524032
External references
- oeis: A346372