a(n) = (1/(n+1)) * Sum_{k=0..n} C(n+k-1,k)*k! = A123680(n)/(n+1).
A123681
a(n) = (1/(n+1)) * Sum_{k=0..n} C(n+k-1,k)*k! = A123680(n)/(n+1).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =19a(4) =197a(5) =2841a(6) =52327a(7) =1171871a(8) =30899529a(9) =937529317a(10) =32173291931
External references
- oeis: A123681