You won’t have to try the combinations of 250 words because the seeds are words at equally spaced distance so at most you have to try 20 combinations. And that’s supposing that all the 250 words are from the seed list, which obviously is not going to happen, so you only have to try a few valid combinations if you forget the number 13. So all you have to remember is the title of the essay and that the seeds are equally spaced, and even the later is not necessary if you think about it just a little bit (just don’t use words from the bip39 wordlist for the rest) and I expect that you are not dumb enough to save the page in only one single place among thousands of other pages. If you want you can save the page in the same way you would save the 12 words, may be with a couple of other documents, but the point is not saving a paper with just 12 words!