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A125725 as a simple table

n a(n)
1 0
2 2
3 16
4 114
5 800
6 5602
7 39216
8 274514
9 1921600
10 13451202
11 94158416
12 659108914
13 4613762400
14 32296336802
15 226074357616
16 1582520503314
17 11077643523200
18 77543504662402
19 542804532636816
20 3799631728457714
21 26597422099204000

[0,2,16,114,800,5602,39216,274514,1921600,
 13451202,94158416,659108914,4613762400,
 32296336802,226074357616,1582520503314,
 11077643523200,77543504662402,542804532636816,
 3799631728457714,26597422099204000]

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Last modified June 11 17:16 EDT 2024. Contains 373315 sequences. (Running on oeis4.)