G.f.: 3F2([2/9, 4/9, 7/9], [1/3, 1], 729 x).A275460G.f.: 3F2([2/9, 4/9, 7/9], [1/3, 1], 729 x).Terms a(0) =1a(1) =168a(2) =72072a(3) =37752000a(4) =21636143100External referencesoeis: A275460