Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points.
A000166
Subfactorial or rencontres numbers, or derangements: number of permutations of n elements with no fixed points.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =2a(4) =9a(5) =44a(6) =265a(7) =1854a(8) =14833a(9) =133496a(10) =1334961a(11) =14684570a(12) =176214841a(13) =2290792932a(14) =32071101049a(15) =481066515734
External references
- oeis: A000166