Some mathematical sequences that caught my attention, implemented in Python.
Each file is a different sequence. The DocString in each sequence function contains links to the OEIS database and/or wikipedia.
There are normally two versions for each sequence: the recursive version, with the postfix: "_seq", and the iterative version, with the postfix: "_seq_it". The reason behind this is that the recursive version is normally easier to understand, while the recursive version is much less performant.