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A139486 as a simple table

n a(n)
0 1
1 3
2 12
3 72
4 720
5 12960
6 440640
7 29082240
8 3780691200
9 975418329600
10 501365021414400
11 514400511971174400
12 1054521049540907520000
13 4321427261018639016960000
14 35409774976786728104970240000
15 580224572769627326728042352640000 

[1,3,12,72,720,12960,440640,29082240,3780691200,
 975418329600,501365021414400,514400511971174400,
 1054521049540907520000,4321427261018639016960000,
 35409774976786728104970240000,
 580224572769627326728042352640000]

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Last modified June 7 22:01 EDT 2024. Contains 373206 sequences. (Running on oeis4.)