Duplicate of A051738.A094167Duplicate of A051738.Terms a(0) =1a(1) =5a(2) =30a(3) =180a(4) =1075a(5) =6366a(6) =37520a(7) =220500a(8) =1293615a(9) =7581240a(10) =44398387External referencesoeis: A094167