6227020799
domain: N
Appears in sequences
- If n is even, 2(n/2 + 1)! - 1; if n is odd, ((n + 1)/2 + 1)! - 1.at n=22A030494
- a(n) = n! - 1.at n=13A033312
- Moebius transform of n!.at n=12A062794
- a(n) = Sum_{1<=k<=n, gcd(n,k)=1} (-1)^(n-k)*Stirling1(n,k).at n=12A096314
- a(n) = prime(n)!-1.at n=5A139189
- a(n) = n! * Sum_{d|n} mu(d) / d!.at n=12A332466
- a(n) = n! * Sum_{d|n} mu(d) / (d!)^(n/d).at n=12A332467