202084

Appears in sequences

• Total preorders.at n=7A006326
• Numerators of Taylor series for tan(x + Pi/4).at n=10A046982
• Triangle T(n,k) (1 <= k <= n) where the first column (T(n,1)) is the sequence of secant numbers A000364.at n=16A064670
• Triangle T(n,k) read by rows; related to number of preorders.at n=43A079502
• Numerators of expansion of arctanh(tan(x)) (odd powers only).at n=5A335257
• a(n) = numerator of (Zeta(2*n+1,1/4) - Zeta(2*n+1,3/4))/Pi^(2*n+1) where Zeta is the Hurwitz zeta function.at n=5A360945