X108: seriesUp

Given n >= 0, create an array with the pattern {1,    1, 2,    1, 2, 3,    ... 1, 2, 3 .. n} (spaces added to show the grouping). Note that the length of the array will be 1 + 2 + 3 ... + n, which is known to sum to exactly n * (n + 1)/2.

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