a(n) = A300617(n) / (n*(n+1)/2) for n>=1.

A300589

a(n) = A300617(n) / (n*(n+1)/2) for n>=1.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =55a(4) =1025a(5) =28638a(6) =1117831a(7) =58157100a(8) =3895841625a(9) =327054041995

External references