When n=2, there are 5 blocks in each horizontal line and 4 blocks in each vertical line.

When n=3, there are 6 blocks in each horizontal line and 5 blocks in each vertical line.

…,

The nth graph has (n+3) blocks in each horizontal row and (n+2) blocks in each vertical row;

So the answer is: (n+3); (n+2)；

(2) When laying the nth figure, * * * uses (n+3)(n+2) tiles;

(3) When n = 10, the total number of tiles is: 13× 12= 156,

The white wattage is:10×11=110.

The number of black cards is:156-110 = 46.

So the amount of money needed is:110× 3+46× 4 = 330+184 = 514 yuan.