G.f.: 3F2([1/9, 5/9, 8/9], [1/3, 1], 729 x).A275455G.f.: 3F2([1/9, 5/9, 8/9], [1/3, 1], 729 x).Terms a(0) =1a(1) =120a(2) =53550a(3) =28973100a(4) =17036182800External referencesoeis: A275455