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Igor Rivin
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In the 1990 paper by Charles Knessl and Joseph Keller, the authors prove the asymptotic result (for $n>>1, k=O(1)$, your number is asymptotic to:

$\dfrac{n^{k-1}}{k[{k-1]!}^2}.$

They show a number of other related asymptotic results.

Igor Rivin
  • 96.4k
  • 11
  • 153
  • 366