[O] Don't treat [n] as a footnote, and export "[n]"

[Rob Stewart]

Hi,

I have the following in an org mode file (that  do not want as inline
verbatim inside =foo=) :

int[2] a;

When I try exporting to HTML, I get the error:

org-export-get-footnote-definition: Definition not found for footnote 2

I've seen two solutions online:
http://emacsclub.github.io/html/org_tutorial.html
https://lists.gnu.org/archive/html/emacs-orgmode/2010-07/msg01248.html

The first works for me, i.e.

#+OPTIONS: f:nil

For this, though, the exported HTML omits the "[2]" text, i.e. the HTML is

int a;

How do I turn off footnotes for [n] where n is a number, so that "[n]"
is exported?

Thanks,

--
Rob