Combinatorial sequence

Friday, November 14, 2014 - 9:00am - 9:50am
Igor Pak (University of California, Los Angeles)
Even a casual reader of OEIS knows that some sequences are quite nice and elegant (e.g. A000108) while others are very erratic and rather difficult (e.g. A000002). One way to explain the difference is to say that the former sequences count natural combinatorial objects, while the latter do not. But what exactly IS a natural combinatorial sequence? We attempt to answer this question.
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