Duplicate of A076098.A081970Duplicate of A076098.Terms a(0) =1a(1) =4a(2) =6a(3) =210a(4) =330a(5) =46410a(6) =1009470a(7) =2454270a(8) =358888530a(9) =8804809860a(10) =14908423530External referencesoeis: A081970