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A164872 as a simple table

n a(n)
1 1
2 2
3 6
4 24
5 120
6 718
7 4884
8 35546
9 264590
10 1969912
11 14560996
12 106781758
13 778073440
14 5643649364
15 40811356112
16 294554236798
17 2123419108962
18 15296729408614
19 110149122090326
20 792974948890068
21 5707931771206042

[1,2,6,24,120,718,4884,35546,264590,1969912,
 14560996,106781758,778073440,5643649364,
 40811356112,294554236798,2123419108962,
 15296729408614,110149122090326,792974948890068,
 5707931771206042]

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Last modified September 16 12:41 EDT 2019. Contains 327113 sequences. (Running on oeis4.)