a(n) = (n!)^n * [x^n] Product_{k>=1} (1 + x^k/(k!)^n).

A336294

a(n) = (n!)^n * [x^n] Product_{k>=1} (1 + x^k/(k!)^n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =28a(4) =257a(5) =103126a(6) =46667437282

External references