Order < ------ Ordinary Queens ------ > < ----- Superqueens ----- >
(“N”) Total Solutions Unique Solutions Total Sol. Unique Sol.
------------------------------------------------------------------------------------------
1 1 1 1 1
2 0 0 0 0
3 0 0 0 0
4 2 1 0 0
5 10 2 0 0
6 4 1 0 0
7 40 6 0 0
8 92 12 0 0
9 352 46 0 0
10 724 92 4 1
11 2,680 341 44 6
12 14,200 1,787 156 22
13 73,712 9,233 1,876 239
14 365,596 45,752 5,180 653
15 2,279,184 285,053 32,516 4,089
16 14,772,512 1,846,955 202,900 25,411
17 95,815,104 11,977,939 1,330,622 166,463
18 666,090,624 83,263,591 8,924,976 1,115,871
19 4,968,057,848 621,012,754 64,492,432 8,062,150
20 39,029,188,884 4,878,666,808 495,864,256 61,984,976
21 314,666,222,712 39,333,324,973 3,977,841,852 497,236,090
22 2,691,008,701,644 336,376,244,042 34,092,182,276 4,261,538,564
23 24,233,937,684,440 3,029,242,658,210 306,819,842,212 38,352,532,487
24 227,514,171,973,736 28,439,272,956,934 2,883,202,816,808 360,400,504,834
25 2,207,893,435,808,352 275,986,683,743,434 28,144,109,776,812 3,518,014,210,402
26 22,317,699,616,364,044 2,789,712,466,510,289 286,022,102,245,804 35,752,764,285,788
└──╼ $./nQueen.py
nQueen Size?4
['0', 'Q', '0', '0']
['0', '0', '0', 'Q']
['Q', '0', '0', '0']
['0', '0', 'Q', '0']
['0', '0', 'Q', '0']
['Q', '0', '0', '0']
['0', '0', '0', 'Q']
['0', 'Q', '0', '0']
2