Computer Riddle

[lissy]

That's where I'm stuck too.
I get what the even numbers are doing when you compare them to the odds but I don't know how the sequence for the odd numbers came about.

Does that make any sense?

[melville]

Watch and see

Well lissy, it has nothing to do with algebra, level 10 that is.
It has everything to do with images and letters ...
hope this helps

Oh no, sorry, my answer has to do with level 11.

Hint For level 10:

you know what to do to the even numbers
with the odd numbers do the reverse and sum up a bit

multiply by x and add with y