|  |  |  | Numbers of monomially non-isometric subspaces of F421 | 
| Dimension | Numbers | 
| 0, 21 | 1 | 
| 1, 20 | 21 | 
| 2, 19 | 1474 | 
| 3, 18 | 9031524 | 
| 4, 17 | 8.070050.871607 | 
| 5, 16 | 22.659836.168205.042673 | 
| 6, 15 | 14.708022.096924.316260.405935 | 
| 7, 14 | 853031.424413.761529.652421.875445 | 
| 8, 13 | 3388.415887.889262.256830.762913.522105 | 
| 9, 12 | 860820.894775.935599.622572.808711.999225 | 
| 10, 11 | 13.748346.261149.201962.052193.248324.809103 | 
|  |  |  |  |  |  | Numbers of monomially non-isometric subspaces of F421 |