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2025-12-25 10:39:36 UTC

julesh on Nostr: The number of gifts sent to you by your true love up to and including the 𝑛th day ...

The number of gifts sent to you by your true love up to and including the 𝑛th day of Christmas is
𝑛(𝑛+1)(𝑛+2)/6
https://oeis.org/A000292