SparseArray[Automatic, {14, 14}, 0, 
 {1, {{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14}, {{1}, {2}, {3}, 
   {4}, {5}, {6}, {7}, {8}, {9}, {10}, {11}, {12}, {13}, {14}}}, 
  {1, 1, 1, 1, 1, 1, -1, -1, 1, E^(((2*I)/3)*Pi), -1 - E^(((2*I)/3)*Pi), 1, 
   -1 - E^(((2*I)/3)*Pi), E^(((2*I)/3)*Pi)}}]
