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  • 2
    \$\begingroup\$ I believe this is A052410 \$\endgroup\$ Commented Dec 1, 2020 at 21:36
  • 1
    \$\begingroup\$ Suggest adding \$0 \to 0\$ and \$1 \to 1\$ to the testcases. \$\endgroup\$ Commented Dec 1, 2020 at 22:31
  • 1
    \$\begingroup\$ I have edited the question: since there is an OEIS and it starts from 1 you don't have to handle n=0, I'll add a test for n=1 \$\endgroup\$ Commented Dec 1, 2020 at 23:11
  • 3
    \$\begingroup\$ If we don't need to handle one it should say "positive" rather than "non-negative". \$\endgroup\$ Commented Dec 2, 2020 at 3:45
  • 2
    \$\begingroup\$ Suggest adding a test case where r == n \$\endgroup\$ Commented Dec 2, 2020 at 9:20