E.g.f.: -1/4*LambertW(-4*x).A052764E.g.f.: -1/4*LambertW(-4*x).Terms a(0) =0a(1) =1a(2) =8a(3) =144a(4) =4096a(5) =160000a(6) =7962624a(7) =481890304a(8) =34359738368External referencesoeis: A052764