18627840

Appears in sequences

• Generalized tangent numbers.at n=7A002302
• Triangle of coefficients in expansion of D^n (tan x) in powers of tan x.at n=38A008293
• Expansion of log(1+x)/cosh(log(1+x)).at n=12A009430
• Third (unsigned) column sequence of triangle A062140 (generalized a=4 Laguerre).at n=6A062260
• Triangle read by rows: nonzero coefficients of the polynomials F_n(x) which express derivatives of tan(z) in terms of powers of tan(z).at n=37A101343
• Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n-1} such that |Image(f)|=h, h=1,2,...,n-1, n=2,3,...at n=34A101819
• Triangle read by rows: T(n,h) = number of functions f:{1,2,...,n}->{1,2,...,n-2} such that |Image(f)|=h, h=1,2,...,n-2; n=3,4,....at n=27A101821
• E.g.f. A(x) satisfies: (A(x)^2 - 4*x)^3 = (2 - A(x)^3)^2.at n=9A249786
• Triangle read by rows: T(n,k) (n>=1, 3<=k<=n+2) is the number of k-sequences of balls colored with n colors such that exactly two balls are of a color seen previously in the sequence.at n=34A281944
• Triangle read by rows: T(n,m) (1<=m<=n) = number of surjections f:[n]->[m] with f(n) != f(j), j<n.at n=52A380977
• Expansion of e.g.f. (1+x) * exp(x^2*(1+x)).at n=11A387968