a(n) = n^7*(n^7 + 1)/2.A168664a(n) = n^7*(n^7 + 1)/2.Terms a(0) =0a(1) =1a(2) =8256a(3) =2392578a(4) =134225920a(5) =3051796875a(6) =39182222016a(7) =339111948196External referencesoeis: A168664