Club de Go de la Facultat de Matematiques de la Universitat de Barcelona
You can find us here in catalan. (may change in a while, we're seeking web hosting at the University)
Also you could find some players at KGS, room GoMUB under Clubs
ilan: On an NxN goban, make a connected group as follows: Start at the bottom left corner and place a go stone. Continue by placing a stone either on top or on the right of the highest and rightmost stone of the group. Continue to do this until you reach the top right corner of the goban, but in such a way that no stone is ever above the main diagonal (x = y). How many ways are there of doing this?