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A154882 as a simple table

n a(n)
1 2
2 4
3 12
4 120
5 7560
6 8648640
7 1927522396800
8 4747472432036420486400
9 128438082648984172330026178330296384000
10 6184173455628205993842062057864303743050691444602955105860128640000

[2,4,12,120,7560,8648640,1927522396800,
 4747472432036420486400,
 128438082648984172330026178330296384000,
 61841734556282059938420620578643037430506914446029\
 55105860128640000]

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Last modified February 24 14:27 EST 2020. Contains 332209 sequences. (Running on oeis4.)