Expansion of e.g.f.: exp(cosh(2*x)-1), even powers only.
A081559
Expansion of e.g.f.: exp(cosh(2*x)-1), even powers only.
Terms
- a(0) =1a(1) =4a(2) =64a(3) =1984a(4) =97024a(5) =6713344a(6) =615829504a(7) =71654785024
External references
- oeis: A081559