12454041600
domain: N
Appears in sequences
- Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n) for n odd.at n=3A006523
- Dirichlet convolution of factorials with themselves.at n=12A034716
- 4*Denominator of S(n)/Pi^n, where S(n) = Sum_{k=-inf..+inf} ((4k+1)^(-n)).at n=13A050971
- E.g.f. 1/(1-x-x^4).at n=12A052593
- Expansion of e.g.f. x*(2+x)/(1-x^2).at n=13A052612
- Expansion of e.g.f. (3+2*x)/(1-x^2).at n=13A052616
- Expansion of e.g.f. (2+x^3-x^4)/(1-x).at n=13A052628
- Expansion of e.g.f. x^2*(2+x-x^2)/(1-x).at n=13A052642
- E.g.f. 2*x^2*(1+x-x^2)/(1-x).at n=13A052645
- Expansion of e.g.f. 2*x^4/(1-x).at n=13A052683
- Expansion of e.g.f. (1 - 2*x*sqrt(1-4*x))*(1 - sqrt(1-4*x))/4.at n=10A052719
- a(0) = 0; a(n) = 2*n! (n >= 1).at n=13A052849
- a(n) = n!/A000793(n).at n=15A074115
- Number of elements of S_n having the maximum possible order g(n), where g(n) is Landau's function (A000793).at n=15A074859
- Expansion of e.g.f. (1+x)/(1-x).at n=13A098558
- a(1)=1. a(n+1) = n!/lcm(a(1),a(2),...,a(n)).at n=26A131120
- a(n) = A131120(n+1)/n.at n=26A131121
- a(n) = A131120(n+1)/n.at n=27A131121
- a(n) = 2*prime(n)!.at n=5A131491
- If S is countable finite set, we can define n as number of elements in S. There are n^n distinct functions f(S)->S. Each function has a fixed point, or an orbit in S. This sequence is a number of distinct functions g(S)->S, with largest orbit.at n=15A162682