1066590

Appears in sequences

• Generalized Euler numbers, c(5,n).at n=3A000187
• Generalized class numbers c_(n,3).at n=4A000508
• Shanks's array c_{a,n} (a >= 1, n >= 0) that generalizes Euler and class numbers, read by antidiagonals upwards.at n=31A235605
• Generalized Euler numbers, a(n) = n!*[x^n](sec(5*x)*(sin(x) + sin(3*x) + cos(2*x) + cos(4*x))).at n=6A349265