2583554048

Appears in sequences

• Generalized Euler numbers c(3,n).at n=5A000436
• Expansion of e.g.f. (sin x + cos x)/cos 3x.at n=10A000810
• Expansion of e.g.f. (sin(2*x) + cos(x)) / cos(3*x).at n=10A007289
• A bisection of A000436.at n=2A156178
• Shanks's array c_{a,n} (a >= 1, n >= 0) that generalizes Euler and class numbers, read by antidiagonals upwards.at n=33A235605