6749040

Appears in sequences

• Triangle of coefficients in expansion of D^n (sec x) / sec x in powers of tan x.at n=32A008294
• Triangle T(n,k), 0 <= k <= n, read by rows, defined by T(0,0) = 1; T(0,k) = 0 if k>0 or if k<0; T(n,k) = k*T(n-1,k-1) + (k+1)*T(n-1,k+1).at n=59A104035
• 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=17A151775
• T(n,n-7), where T(*,*) is A350970.at n=4A350974