-1385

Appears in sequences

• Exponential Riordan array (sech(x), tanh(x)).at n=29A060081
• Real part of the coefficient [x^n] of the expansion of (1+i)/(1-i*exp(x)) - 1 multiplied by 2*n!, where i is the imaginary unit.at n=8A163982
• Numerators of generalized Bernoulli numbers associated with the zigzag numbers A000111.at n=9A185424
• The infinite Seidel matrix H read by antidiagonals upwards; H = (H(n,k): n,k >= 0).at n=46A236935
• Interleave (-1)^n*(A000182(n+1) - A000364(n)), -A028296(n+1).at n=7A239322
• a(n) = -2^n*(E(n, 1/2) + E(n, 1) + (n mod 2)*2*(E(n+1, 1/2) + E(n+1, 1))), where E(n, x) are the Euler polynomials.at n=8A240559
• a(n) = E(n) - E(n+1), where E(n) are the Euler numbers A122045(n).at n=7A241209
• Triangle of coefficients of Gaussian polynomials [2n+5,5]_q represented as finite sum of terms (1+q^2)^k*q^(g-k), where k = 0,1,...,g with g=5n.at n=74A267485
• A Seidel matrix A(n,k) read by antidiagonals upwards.at n=36A323833
• A Seidel matrix A(n,k) read by antidiagonals downwards.at n=36A323834
• a(n) = Sum_{k=0..floor(n/2)} A323833(n,k) if A323833 is read as a triangle.at n=7A342195