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Sep 25, 2018 at 16:03 history edited Aleksandar Milivojević CC BY-SA 4.0
added 32 characters in body
Sep 25, 2018 at 15:43 comment added abx Note that the formula for $\chi$ can be expressed as $\frac{1}{d}\left[ (1-d)^{n+2}+d(n+2)-1\right]$, which seems easier to compute...
Sep 25, 2018 at 15:14 history answered Aleksandar Milivojević CC BY-SA 4.0