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A252764 as a simple table

n a(n)
1 1
2 2
3 24
4 240
5 3120
6 46410
7 823536
8 16773120
9 387419760
10 9999899910
11 285311670600
12 8916097441680
13 302875106592240
14 11112006720144330
15 437893890380096640
16 18446744069414584320
17 827240261886336764160
18 39346408075098144278664
19 1978419655660313589123960

[1,2,24,240,3120,46410,823536,16773120,387419760,
 9999899910,285311670600,8916097441680,
 302875106592240,11112006720144330,
 437893890380096640,18446744069414584320,
 827240261886336764160,39346408075098144278664,
 1978419655660313589123960]

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Last modified June 6 17:33 EDT 2020. Contains 334831 sequences. (Running on oeis4.)