a(n) = n!*LaguerreL(n, -8*n).A277422a(n) = n!*LaguerreL(n, -8*n).Terms a(0) =1a(1) =9a(2) =322a(3) =19446a(4) =1649688a(5) =180184120a(6) =24070390992External referencesoeis: A277422