Expansion of e.g.f. Product_{k>=1} sec(x^k) (even powers only).
A330516
Expansion of e.g.f. Product_{k>=1} sec(x^k) (even powers only).
Terms
- a(0) =1a(1) =1a(2) =17a(3) =601a(4) =44225a(5) =4589041a(6) =781157585a(7) =162882093193
External references
- oeis: A330516