Re: [math-fun] Billiard word counts (was "Interleavings of three arithmetic progressions")

Yes, I am on the math-fun mailing list! The lgdegf search does refer to log deriv of a generating function If you go to the foot of any OEIS page, and click on Superseeker, you will see more about what Superseeker does, including all the source code It uses the Maple gfun package to search for generating functions. See for example pictor.math.uqam.ca/~plouffe/articles/gfun.pdf Neil