a(n) = (-1)^n * n! * Laguerre(n, 4*n).

A332679

a(n) = (-1)^n * n! * Laguerre(n, 4*n).

Terms

    a(0) =1a(1) =3a(2) =34a(3) =642a(4) =16920a(5) =571880a(6) =23577552a(7) =1147008912a(8) =64304389504

External references