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A304843 as a simple table

n a(n)
1 4
2 12
3 25
4 51
5 165
6 419
7 1009
8 2697
9 7091
10 18147
11 46901
12 122403
13 317379
14 820951
15 2131357
16 5532371
17 14340367
18 37190407
19 96488757
20 250257339
21 649031555
22 1683483587
23 4366629269
24 11325556739
25 29375297911
26 76192462975
27 197622279245

[4,12,25,51,165,419,1009,2697,7091,18147,46901,
 122403,317379,820951,2131357,5532371,14340367,
 37190407,96488757,250257339,649031555,1683483587,
 4366629269,11325556739,29375297911,76192462975,
 197622279245]

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Last modified October 18 18:47 EDT 2021. Contains 348068 sequences. (Running on oeis4.)