Number of Columns: 2
Number of Rows	Total Solutions
2	0
3	0
4	2
5	6
6	12
7	20
8	30
9	42
10	56
11	72
12	90
13	110
14	132
15	156
16	182
17	210
18	240
19	272
20	306
21	342
22	380
23	420
24	462
25	506
26	552
27	600
28	650
29	702
30	756

Equation (where "r" is the number of rows):

solutions = (r-3)*(r-2)

for r > 3