a(n) = Sum_{k=0..n} k!^3.A289948a(n) = Sum_{k=0..n} k!^3.Terms a(0) =1a(1) =2a(2) =10a(3) =226a(4) =14050a(5) =1742050a(6) =374990050a(7) =128399054050External referencesoeis: A289948