Expansion of e.g.f. cos(x)/cos(tan(x)), even powers only.
A009106
Expansion of e.g.f. cos(x)/cos(tan(x)), even powers only.
Terms
- a(0) =1a(1) =0a(2) =8a(3) =216a(4) =12032a(5) =1075328a(6) =140944000a(7) =25464568832
External references
- oeis: A009106