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A110047 as a simple table

n a(n)
0 1
1 6
2 28
3 144
4 688
5 3360
6 16192
7 78336
8 378112
9 1826304
10 8817664
11 42577920
12 205582336
13 992649216
14 4792926208
15 23142334464
16 111741042688
17 539533639680
18 2605098729472
19 12578530000896
20 60734514921472
21 293252181786624
22 1415946786832384
23 6836795882864640

[1,6,28,144,688,3360,16192,78336,378112,1826304,
 8817664,42577920,205582336,992649216,4792926208,
 23142334464,111741042688,539533639680,
 2605098729472,12578530000896,60734514921472,
 293252181786624,1415946786832384,6836795882864640]

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Last modified August 11 15:12 EDT 2020. Contains 336428 sequences. (Running on oeis4.)