...followup after looking through comments on OP, indeed someone else already had the idea to tie in OEIS sequences in the comment at https://www.johndcook.com/blog/2025/10/26/987654321/#comment...
but i still wonder if there is something like OEIS for observations / analysis like this
That was me. The best I know is to find a related sequence and look it up in the OEIS.