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  "body": "\n## Summary\n\nThe derangement numbers $D_n$ count the permutations of $n$ elements with no fixed point. They grow like $n!/e$. The node [[number of derangements|03WY4HHMT1]] gives the precise definition.\n",
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        "locator": "Counting derangements",
        "url": "https://en.wikipedia.org/wiki/Derangement"
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  "name": "Number of derangements",
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  "url": "https://math2.tamnd.com/wiki/number-of-derangements/",
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