• aliceitc@lemmy.blahaj.zone
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      7 hours ago

      1, 3, 10

      That’s a nice sequence!

      A001700

      a(n) = binomial(2*n+1, n+1): number of ways to put n+1 indistinguishable balls into n+1 distinguishable boxes = number of (n+1)-st degree monomials in n+1 variables = number of monotone maps from 1..n+1 to 1..n+1.