Bell numbers
( go to the article → http://feedproxy.google.com/~r/TheEndeavour/~3/JTG7_4MeJY0/ )
The nth Bell number is the number of ways to partition a set of n labeled items. It’s also equal to the following sum. You may have to look at that sum twice to see it correctly. It looks a lot like the sum for en except the roles of k and n are reversed in […]
June 5, 2018, 7:55 p.m.
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