11491200

Appears in sequences

• a(n+1) = (n-1)*a(n) + n*n!.at n=8A006157
• Triangle of coefficients in expansion of D^n (sec x) / sec x in powers of tan x.at n=34A008294
• Triangle read by rows: T(n,k) = value of (d^2n/dx^2n) (tan^(2k)(x)/cos(x)) at the point x = 0.at n=19A151775
• Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments.at n=30A249253
• 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=41A360961
• E.g.f. satisfies A(x) = exp(x^3 * A(x)^3 / (1 - x)).at n=9A376495