I was totally doing math in this dream last night. It was some number-theoretical thing that came out as something vaguely like pascal's triangle, but not with such a simplistic rule as "add the two guys above you to get your value". The first three rows were 1, 1 2, 1 3 1, I think. Each entry counted how may pairs of integers that had some property relative to its coordinates, but I totally forgot what it was as soon as I woke up. I'm so pissed off.