I think this particular table isn't right.  This one seems to work for me:

```python
LATEX_SUBS = {
    '&':  r'\&',
    '%':  r'\%', 
    '$':  r'\$', 
    '#':  r'\#', 
    '_':  r'\_', 
    '{':  r'\{', 
    '}':  r'\}',
    '~':  r'\textasciitilde{}', 
    '^':  r'\^{}', 
    '\\': r'\textbackslash{}',
}
```