Counting the solutions of the 28-queens problem

Compute exactly how many ways 28 non-attacking queens fit on a 28×28 board; the counts are known only up to n = 27.

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1	{
2	"domain": "computer-science",
3	"topics": [
4	"constraint-programming",
5	"algorithms-complexity"
6	],
7	"type": "algorithm",
8	"source": {
9	"key": "csplib",
10	"name": "CSPLib",
11	"url": "https://www.csplib.org/Problems/prob054/",
12	"id": "prob054",
13	"curator": "CSPLib editors",
14	"poser": "Bilal Syed Hussain",
15	"status": "open",
16	"as_of": "2026-10-20",
17	"catalog": "0521c19bbd38"
18	},
19	"review": true,
20	"approval": "first-time"
21	}