a(n) = Sum_{k=0..n} k^(k*(n-k)).A349893a(n) = Sum_{k=0..n} k^(k*(n-k)).Terms a(0) =1a(1) =2a(2) =3a(3) =7a(4) =46a(5) =1052a(6) =88603a(7) =27121965a(8) =37004504306External referencesoeis: A349893