65383718400
domain: N
Appears in sequences
- a(n) = n!*(2*n-5)/2.at n=10A034860
- Expansion of e.g.f.: (1 - 4*x + 3*x^2)*(1 - 2*x - sqrt(1-4*x))/2 - x^2 + 2*x^3.at n=11A052720
- a(n) = (n+1)!/(d(n)*d(n+1)) where d(n) = cancellation factor in reducing Sum_{k=0...n} 1/k! to lowest terms.at n=14A123899
- a(n) = the largest divisor of n! such that (sum{k=1 to n} a(k)) is a divisor of n!.at n=15A156832