E.g.f.: (1 - sinh(x)) / (1 - 2*sinh(x)).

A332257

E.g.f.: (1 - sinh(x)) / (1 - 2*sinh(x)).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =25a(4) =208a(5) =2161a(6) =26944a(7) =391945a(8) =6515968a(9) =121866721a(10) =2532496384a(11) =57890223865

External references