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	+}