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Haskell, 78 bytes (!)0.(*2) i!n|i<n=(drop 3$(n-i)#' '++"_/"++i#'#'):(i+2)!n|0<1=[] (#)=replicate Try it online!
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# [Haskell], 78 bytes <!-- language-all: lang-hs --> (!)0.(*2) i!n|i<n=(drop 3$(n-i)#' '++"_/"++i#'#'):(i+2)!n|0<1=[] (#)=replicate [Try it online!][TIO-kt9j0osz] [Haskell]: https://www.haskell.org/ [TIO-kt9j0osz]: https://tio.run/##DcrBDoIgGADgu0@B0gbEJLNDmxPvbd06VmtM0f5Ffwzx1rNHXr99TzO/rHNp1LfEc1Epvq1FBjl@oUXNh/Dx5LDhWIKgjDApi8eukBIoo0w0HGQt1lu1e329Z5wKHax30Jto09sAEk0mG8@AlnSdJn6JlxjUgm6VWY2KB2uGplkRcCq7E0aRjr9@dGaaU9l7/wc "Haskell – Try It Online"