a(n) = n^6*(n^7 + 1)/2.A168631a(n) = n^6*(n^7 + 1)/2.Terms a(0) =0a(1) =1a(2) =4128a(3) =797526a(4) =33556480a(5) =610359375a(6) =6530370336a(7) =48444564028a(8) =274878038016External referencesoeis: A168631