Expansion of e.g.f. sqrt(sec(sqrt(2)*x)), showing coefficients of only the even powers of x.
A126156
Expansion of e.g.f. sqrt(sec(sqrt(2)*x)), showing coefficients of only the even powers of x.
Terms
- a(0) =1a(1) =1a(2) =7a(3) =139a(4) =5473a(5) =357721a(6) =34988647a(7) =4784061619a(8) =871335013633
External references
- oeis: A126156