E.g.f.: exp( Sum_{n>=1} n!*x^(2*n)/(2*n)! ) = Sum_{n>=0} a(n)*x^(2*n)/(2*n)!.
A193444
E.g.f.: exp( Sum_{n>=1} n!*x^(2*n)/(2*n)! ) = Sum_{n>=0} a(n)*x^(2*n)/(2*n)!.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =51a(4) =857a(5) =21045a(6) =702597a(7) =30379839a(8) =1642718865a(9) =108171928521
External references
- oeis: A193444