6894720

Appears in sequences

• a(n) = (2n+1)*n!.at n=9A007680
• Expansion of e.g.f. 1/(1-x-x^3).at n=9A052556
• E.g.f. 1/(1-x-2*x^2).at n=8A052585
• Related to number of labeled partially ordered sets.at n=9A076301
• A Jacobsthal number related number triangle.at n=36A110321
• Triangle read by rows: T(n,k) = number of permutations p of [n] such that max(|p(i)-i|)=k (n>=1, 0<=k<=n-1).at n=65A130152
• Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.at n=36A249247
• Number of inequivalent ways to color the edges of a tetrahedron using at most n colors so that no color appears more than twice.at n=21A282820
• Triangle read by rows (1<=k<=n): T(n,k) = (n-k+1)*k! - (k-1)!at n=64A288778
• Number of permutations p of [n] such that max_{j=1..n} |p(j)-j| = 10.at n=1A323806
• Triangle T(m,n) read by rows: the number of homomorphisms of the complete graph on n vertices to the quasi-complete graph on m vertices, m>=3, 3<=n<m.at n=34A360961