a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(k*n).A349891a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(k*n).Terms a(0) =1a(1) =0a(2) =16a(3) =19619a(4) =4294436111External referencesoeis: A349891