Expansion of e.g.f. sec(arctanh(x)*cos(x)), only even powers.
A012748
Expansion of e.g.f. sec(arctanh(x)*cos(x)), only even powers.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =25a(4) =3617a(5) =340145a(6) =40490657a(7) =7034559753
External references
- oeis: A012748