a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(3*n).A349902a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(3*n).Terms a(0) =1a(1) =1a(2) =63a(3) =19172a(4) =16249870a(5) =29458152441External referencesoeis: A349902