a(n) = n!*LaguerreL(n, -7*n).A277421a(n) = n!*LaguerreL(n, -7*n).Terms a(0) =1a(1) =8a(2) =254a(3) =13614a(4) =1025048a(5) =99368620a(6) =11781698256External referencesoeis: A277421