a(n) = (2*n)! [x^(2*n)] cosh(x)^(-3).

A326328

a(n) = (2*n)! [x^(2*n)] cosh(x)^(-3).

Terms

    a(0) =1a(1) =-3a(2) =33a(3) =-723a(4) =25953a(5) =-1376643a(6) =101031873a(7) =-9795436563

External references