250737

Appears in sequences

• Expansion of cos(x)/cos(2x).at n=4A000281
• Expansion of cos x (1 + sin x ) /cos 2x.at n=8A000825
• Generalized Euler numbers, or Springer numbers.at n=8A001586
• Number triangle read by rows, related to exp(x)/(cos(x) + sin(x)).at n=36A117442
• Table of coefficients of a polynomial sequence related to the Springer numbers.at n=36A185417
• Square array, read by antidiagonals, used to recursively calculate the Springer numbers A001586.at n=36A185418
• Square array, read by antidiagonals, used to recursively calculate the Springer numbers A001586.at n=37A185418
• Expansion of e.g.f. exp(x)/cosh(2*x).at n=8A188458
• The right-hand half-triangle of A185356 (or A202690).at n=36A202815
• The left-hand half-triangle of A185356 (or A202690).at n=36A202816
• Expansion of e.g.f.: exp(-x) / cosh(2*x).at n=8A212435
• Triangle read by rows, coefficients of polynomials related to the Springer numbers A001586.at n=36A214554
• Shanks's array c_{a,n} (a >= 1, n >= 0) that generalizes Euler and class numbers, read by antidiagonals upwards.at n=19A235605
• A signed triangle of V. I. Arnold for the Springer numbers (A001586).at n=43A256679
• A signed triangle of V. I. Arnold for the Springer numbers (A001586).at n=44A256679
• a(n) = 4^n*Euler(n, 1/4)*2^(valuation_{2}(n + 1)).at n=8A339058
• Triangle read by rows: coefficients of type B alternating Eulerian polynomials.at n=36A343170
• Triangle read by rows: coefficients of type B alternating Eulerian polynomials.at n=44A343170
• Irregular triangle read by rows: coefficients of polynomials xi_n.at n=20A343171
• Array A(n, k) that generalizes Euler numbers, class numbers, and tangent numbers, read by ascending antidiagonals.at n=53A349271