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tri_recursion <- function(k) {
  if (k > 0) {
    result <- k + tri_recursion(k - 1)
    print(result)
  } else {
    result = 0
    return(result)
  }
}
tri_recursion(6)
[1] 1
[1] 3
[1] 6
[1] 10
[1] 15
[1] 21