a(n) = (-1)^n * n! * Laguerre(n, 5*n).

A332694

a(n) = (-1)^n * n! * Laguerre(n, 5*n).

Terms

    a(0) =1a(1) =4a(2) =62a(3) =1614a(4) =58904a(5) =2764880a(6) =158631120a(7) =10755909010a(8) =841471425920

External references