G.f.: 1/(Sum_{k>=0} (k!)^2 x^k).

A113871

G.f.: 1/(Sum_{k>=0} (k!)^2 x^k).

Terms

    a(0) =1a(1) =-1a(2) =-3a(3) =-29a(4) =-499a(5) =-13101a(6) =-486131a(7) =-24266797a(8) =-1571357619a(9) =-128264296301

External references