Interpret Wolfram Alpha Closed Form Equation

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The closed form number pattern equation for 1, 1, 2, 6 on Wolfram Alpha is:

$a_n = (1)_{n-1}$

What does this mean?

i.e. $a_n = n$ is for 1, 2, 3, 4

Note: "n" starts at 1 (1st term)

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Looking at the output from wolfram alpha that is the pochhammer symbol