E.g.f.: exp(sec(x)-1) = 1 + Sum_{n>0} a(n)*x^(2*n)/(2*n)!.
A217502
E.g.f.: exp(sec(x)-1) = 1 + Sum_{n>0} a(n)*x^(2*n)/(2*n)!.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =151a(4) =5123a(5) =271396a(6) =20605133a(7) =2116186801a(8) =282013329788
External references
- oeis: A217502