2873041

Properties

Appears in sequences

• Expansion of e.g.f. sin(x)/cos(2*x).at n=4A000464
• Expansion of (sin^2 x + sin x) /cos 2x.at n=9A000822
• Generalized Euler numbers, or Springer numbers.at n=9A001586
• Square array, read by antidiagonals, used to recursively calculate the Springer numbers A001586.at n=45A185418
• Square array, read by antidiagonals, used to recursively calculate the Springer numbers A001586.at n=46A185418
• Expansion of e.g.f. exp(x)/cosh(2*x).at n=9A188458
• Shanks's array d_{a,n} (a >= 1, n >= 1) that generalizes the tangent numbers, read by antidiagonals upwards.at n=19A235606
• Numerators of coefficients in expansion of 1/(cos x - sin x).at n=9A279257
• Irregular triangle read by rows: coefficients of polynomials xi_n.at n=25A343171
• Square array T(n, k) = numerator( zeta_r(2*n) * sqrt(A003658(k + 2)) / Pi^(4*n) ), read by antidiagonals, where zeta_r is the Dedekind zeta-function over r and r is the real quadratic field with discriminant A003658(k + 2).at n=22A370412
• Prime numbersat n=208318