double factorial binomial(2n, n) - Wolfram|Alpha
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Input:

RawBoxes[RowBox[{(, , (, GridBox[{{n}, {k}}, GridBoxAlignment -> {Columns -> {{Center}}}, GridBoxItemSize -> {Columns -> {{Automatic}}, Rows -> {{Automatic}}}, GridBoxSpacings -> {Columns -> {{Automatic}}, Rows -> {{0.4}}}], ), , )}]] is the double factorial binomial coefficient
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Result:

link to /input/?i=%28%282+n%29%21%21%29%2F%28n%21%21%29%5E2&lk=1&a=ClashPrefs_*Math-
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