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A013523 as a simple table

n a(n)
0 2
1 48
2 768
3 645120
4 37158912
5 81749606400
6 784796221440
7 42849873690624000
8 548478383239987200
9 63777066403145711616000
10 4285818862291391820595200
11 216862434431944426122117120000
12 8007228348256409579893555200000
13 1461479318123759876522171695104000000

[2,48,768,645120,37158912,81749606400,
 784796221440,42849873690624000,548478383239987200,
 63777066403145711616000,4285818862291391820595200,
 216862434431944426122117120000,
 8007228348256409579893555200000,
 1461479318123759876522171695104000000]

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Last modified May 8 09:21 EDT 2021. Contains 343666 sequences. (Running on oeis4.)