E.g.f.: log( 2*cosh(x) / (1 + sqrt(1 - 2*sinh(2*x))) ).

A318000

E.g.f.: log( 2*cosh(x) / (1 + sqrt(1 - 2*sinh(2*x))) ).

Terms

    a(0) =1a(1) =4a(2) =24a(3) =256a(4) =3840a(5) =73024a(6) =1688064a(7) =45991936a(8) =1443102720a(9) =51249316864

External references