User blog:QuasarBooster/What's that video?

I don't remember if I saw it on this site, but there was this animation somewhere on the internet regarding googology. I remember it was in Japanese and there were two kids being shown all the ways to get from the top left corner of a square grid to the bottom right corner. The teacher started with a 1x1 grid (just a square) then did 2x2, 3x3, and so on. I remember the numbers getting pretty big and how the teacher resorted to a supercomputer to calculate further square grids. Does this sound familiar to anybody?