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2 hours ago answer added Max Alekseyev timeline score: 12
3 hours ago comment added Joshua P. Swanson Fabius' link uncovers the OEIS entry and with it several citations: oeis.org/A001142
3 hours ago comment added Fabius Wiesner With Approach Zero you can search formulas in math.stackexchange.com and artofproblemsolving.com.
4 hours ago comment added R. van Dobben de Bruyn Sometimes, this type of formula has an even shorter proof by exhibiting some bijection, but I don't see an obvious one in this case.
4 hours ago answer added KConrad timeline score: 10
4 hours ago comment added Christian Remling Now that we have the formula, it's probably very easy to prove it by induction.
5 hours ago history asked Melanzio CC BY-SA 4.0