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A122623 as a simple table

n a(n)
1 2
2 4
3 8
4 22
5 98
6 388
7 16648
8 132358
9 1311234
10 1073743876
11 17179877384
12 274877943814
13 4398113693698
14 72083983122432004
15 3458834890081107976
16 110681871838615896070
17 38686511673635471463677954
18 2475908412805686633409019908
19 198070557401964757114570145800

[2,4,8,22,98,388,16648,132358,1311234,1073743876,
 17179877384,274877943814,4398113693698,
 72083983122432004,3458834890081107976,
 110681871838615896070,38686511673635471463677954,
 2475908412805686633409019908,
 198070557401964757114570145800]

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Last modified July 7 16:01 EDT 2020. Contains 335496 sequences. (Running on oeis4.)