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A173280 as a simple table

n a(n)
0 1
1 1
2 3
3 7
4 29
5 129
6 757
7 5185
8 41155
9 368351
10 3671635
11 40295943
12 482758111
13 6268066531
14 87668492115
15 1314023850727
16 21011431917453
17 357014074280785
18 6423561495057421
19 122004755658629081
20 2439367774898883497
21 51213663674167659301
22 1126452985959434543237

[1,1,3,7,29,129,757,5185,41155,368351,3671635,
 40295943,482758111,6268066531,87668492115,
 1314023850727,21011431917453,357014074280785,
 6423561495057421,122004755658629081,
 2439367774898883497,51213663674167659301,
 1126452985959434543237]

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Last modified November 12 19:19 EST 2018. Contains 317116 sequences. (Running on oeis4.)