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A163941 as a simple table

n a(n)
0 1
1 9
2 52
3 246
4 1039
5 4083
6 15274
7 55152
8 193957
9 668397
10 2266816
11 7589418
12 25143355
13 82571751
14 269173078
15 871958244
16 2809322833
17 9008574945
18 28768068460
19 91532284830
20 290283189991
21 917912770779
22 2894936303362

[1,9,52,246,1039,4083,15274,55152,193957,668397,
 2266816,7589418,25143355,82571751,269173078,
 871958244,2809322833,9008574945,28768068460,
 91532284830,290283189991,917912770779,
 2894936303362]

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Last modified July 5 23:36 EDT 2020. Contains 335475 sequences. (Running on oeis4.)