663061
domain: N
Appears in sequences
- Related to Euler numbers, expansion of e.g.f. sec(x)*tan^2(x).at n=7A002735
- Triangle of numbers related to A000330 (sum of squares) and A000364 (Euler numbers).at n=25A060058
- Fifth column of triangle A060058.at n=2A060062
- Triangle A060058 by diagonals.at n=23A060074
- Third column of triangle A060074.at n=4A060075
- Exponential Riordan array (sech(x), tanh(x)).at n=57A060081