a(n) = n^(2*n) - n^(2*n - 1).A259926a(n) = n^(2*n) - n^(2*n - 1).Terms a(0) =0a(1) =8a(2) =486a(3) =49152a(4) =7812500a(5) =1813985280a(6) =581334062442External referencesoeis: A259926