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A217576 as a simple table

n a(n)
1 1
2 3
3 7
4 29
5 121
6 765
7 5041
8 40913
9 363097
10 3643233
11 39916801
12 479535185
13 6227020801
14 87203692929
15 1307676103777
16 20924415922433
17 355687428096001
18 6402505760917569
19 121645100408832001
20 2432915176581403649
21 51090942299733783937
22 1124002321128529922049

[1,3,7,29,121,765,5041,40913,363097,3643233,
 39916801,479535185,6227020801,87203692929,
 1307676103777,20924415922433,355687428096001,
 6402505760917569,121645100408832001,
 2432915176581403649,51090942299733783937,
 1124002321128529922049]

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Last modified June 20 15:30 EDT 2021. Contains 345165 sequences. (Running on oeis4.)