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A222741 as a simple table

n a(n)
1 0
2 6
3 20
4 685
5 5370
6 123410
7 1341616
8 25106526
9 321557310
10 5447475968
11 76079350800
12 1228204709225
13 17971182592538
14 283558808435910
15 4256630623481552
16 66474347415079345
17 1012439882213494794

[0,6,20,685,5370,123410,1341616,25106526,
 321557310,5447475968,76079350800,1228204709225,
 17971182592538,283558808435910,4256630623481552,
 66474347415079345,1012439882213494794]

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Last modified June 19 15:52 EDT 2021. Contains 345143 sequences. (Running on oeis4.)