E.g.f. is cos(tan(x)/cos(x)), coefficients of even powers of x.
A009081
E.g.f. is cos(tan(x)/cos(x)), coefficients of even powers of x.
Terms
- a(0) =1a(1) =-1a(2) =-19a(3) =-517a(4) =-18023a(5) =-587529a(6) =19183749a(7) =12219870323
External references
- oeis: A009081