-24611

Appears in sequences

• Number triangle read by rows, related to exp(x)/(cos(x) + sin(x)).at n=28A117442
• Expansion of e.g.f. exp(x)/cosh(2*x).at n=7A188458
• Array read by ascending antidiagonals: A(n, k) = (-2*n)^k * Euler(k, (n - 1)/(2*n)) for n >= 1 and A(0, k) = 1.at n=52A378066