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A228655 as a simple table

n a(n)
1 2
2 8
3 34
4 140
5 574
6 2348
7 9598
8 39224
9 160282
10 654944
11 2676202
12 10935332
13 44683222
14 182581508
15 746051878
16 3048465200
17 12456425842
18 50898577976
19 207978216754
20 849826072316
21 3472499977390
22 14189087019740
23 57978456949582

[2,8,34,140,574,2348,9598,39224,160282,654944,
 2676202,10935332,44683222,182581508,746051878,
 3048465200,12456425842,50898577976,207978216754,
 849826072316,3472499977390,14189087019740,
 57978456949582]

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Last modified January 17 15:12 EST 2020. Contains 330958 sequences. (Running on oeis4.)