a(n) = Product_{k=0..n} (k^n + (n-k)^n).A323751a(n) = Product_{k=0..n} (k^n + (n-k)^n).Terms a(0) =2a(1) =1a(2) =32a(3) =59049a(4) =14101250048External referencesoeis: A323751