E.g.f.: Sum_{n >= 0} a(n)*x^(2*n)/(2*n)! = sec(2*x).
A002436
E.g.f.: Sum_{n >= 0} a(n)*x^(2*n)/(2*n)! = sec(2*x).
Terms
- a(0) =1a(1) =4a(2) =80a(3) =3904a(4) =354560a(5) =51733504a(6) =11070525440
External references
- oeis: A002436
A002436
E.g.f.: Sum_{n >= 0} a(n)*x^(2*n)/(2*n)! = sec(2*x).