I'd like to see that there is a bang for the website I see in the results. So, for example, when I search for A005096 oeis, I see the following result:
Opening the shield / info pane shows the usual information about the result, but I'd actually like to see that the "!seq" and "!oeis" bangs are available to search this result directly.
A possible way would be to display this in the domain info, like this:
I don't think other search engines implement this. Adding this feature would extend the usefulness of bangs because it would allow users to discover where bangs are available without explicitly searching for them. I personally just guessed that there is probably an OEIS bang and had to look it up, it would be very convinient to be able to look this up right in the result screen.