The easiest way to find the formula for a progression is to check OEIS first. The second-easiest way is the method of differences. There is no #3. https://www.quora.com/Is-there-a-common-algorithm-to-find-the-pattern-of-not-so-obvious-progressions-such-as-a2-1-a3-5-a4-14-a8-140-What-is-the-easiest-way-to-find-formation-laws-of-such-series/answer/Mark-Gritter?ch=2&srid=uabQ …
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oeis would have driven the Bernoullis to distraction
10:50 PM - 22 Nov 2019
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