E.g.f.: sec(sec(x)*sinh(x))=1+1/2!*x^2+21/4!*x^4+837/6!*x^6+60585/8!*x^8...
A012819
E.g.f.: sec(sec(x)*sinh(x))=1+1/2!*x^2+21/4!*x^4+837/6!*x^6+60585/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =21a(3) =837a(4) =60585a(5) =7048489a(6) =1201350909a(7) =282008557677
External references
- oeis: A012819