a(n) = n^6*(n^9 + 1)/2.A168633a(n) = n^6*(n^9 + 1)/2.Terms a(0) =0a(1) =1a(2) =16416a(3) =7174818a(4) =536872960a(5) =15258796875a(6) =235092515616External referencesoeis: A168633