1491632525

Appears in sequences

• Multiples of Euler numbers.at n=5A002438
• E.g.f.: (sin x + cos 2x) / cos 3x.at n=10A007286
• a(n) = Im((1-I)^(1-n)*A_{n, 3}(I)) where A_{n, k}(x) are the generalized Eulerian polynomials.at n=10A225147