Expansion of e.g.f.: cosh(x/sqrt(1-x^2)) (even powers).

A081442

Expansion of e.g.f.: cosh(x/sqrt(1-x^2)) (even powers).

Terms

    a(0) =1a(1) =1a(2) =13a(3) =421a(4) =25369a(5) =2449801a(6) =346065061a(7) =67243537453

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