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# [Haskell], 18 bytes <!-- language-all: lang-hs --> n!g=foldl1 g[1..n] [Try it online!][TIO-ks6776el] [Haskell]: https://www.haskell.org/ [TIO-ks6776el]: https://tio.run/##ZY7LCsIwEEX3/YobcJEHlCbQZb9EXCSk1mCaSBTx7@NYXRSzGQ6Hc2Eu9n6dY6w1sWU65@ijxnLUfZ9OdbUhYYLPHXArIT1wgGYAV2JnxsZsjWwa@d@8ctkZ05ixMXpgm@nowGKg7@yPHXGZV3ALBSdgoGhoID8DcB@eFBnxJUdU3w "Haskell – Try It Online"