7620480
domain: N
Appears in sequences
- Coefficients of Laguerre polynomials.at n=5A001812
- Expansion of e.g.f.: (1-x)/(1 - x - x^2).at n=9A052554
- Expansion of e.g.f. (2+x-x^2)/(1-x)^2.at n=9A052649
- a(n) = (2*n+1)*(n-1)!.at n=9A129326
- Number of permutations divided by the number of (binary) heaps on n elements.at n=20A132862
- Triangle read by rows: T(n,m) = A094310(n,m)*A120070(n+1,m), 1 <= m <= n.at n=39A165969
- Number of non-attacking placements of 5 rooks on an n X n board.at n=9A179060
- The number of strongly connected digraphs with n vertices and n+1 edges.at n=7A272582
- Lexicographically least strictly increasing sequence such that, for any n>0, Sum_{k=1..n} a(k) can be computed without carries in factorial base.at n=27A279732
- Triangle read by rows: binomial(n,k)*(2*n-k)!, n>=0, 0<=k<=n.at n=33A328826
- a(n) = abs(A021009(n, floor(n/2))).at n=10A343580
- Expansion of e.g.f. 1 / ( 1 - Sum_{k>=0} x^(3*k+2) / (3*k+2) ).at n=11A365978