a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
A343707
a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =113a(4) =1145a(5) =14539a(6) =221663a(7) =3943281a(8) =80173345a(9) =1833831619a(10) =46606646175
External references
- oeis: A343707