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A173411 as a simple table

n a(n)
2 4
3 12
4 42
5 152
6 562
7 2108
8 7986
9 30476
10 116950
11 450756
12 1743470
13 6763152
14 26299104
15 102478208
16 400032822
17 1563985172
18 6122945694
19 23999991452
20 94173327894
21 369881810616
22 1454036828992
23 5720448937528
24 22521468585822
25 88725551176384

[4,12,42,152,562,2108,7986,30476,116950,450756,
 1743470,6763152,26299104,102478208,400032822,
 1563985172,6122945694,23999991452,94173327894,
 369881810616,1454036828992,5720448937528,
 22521468585822,88725551176384]

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Last modified August 12 13:08 EDT 2022. Contains 356077 sequences. (Running on oeis4.)