Total SuperQueen Solutions
for Rectangular Chessboards

Number of Columns: 4
Number of Rows
Total Solutions
4
0
5
0
6
0
7
0
8
12
9
60
10
180
11
432
12
900
13
1,692
14
2,940
15
4,800
16
7,452
17
11,100
18
15,972
19
22,320
20
30,420
21
40,572
22
53,100
23
68,352
24
86,700
25
108,540
26
134,292
27
164,400
28
199,332
29
239,580
30
285,660

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

solutions = [(r-7)*(r-6)*(r-5)*(r-4)+(r-10)*(r-9)*(r-8)*(r-7)]/2

for r > 7