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A223946 as a simple table

n a(n)
1 6
2 36
3 157
4 558
5 1821
6 5951
7 20275
8 71653
9 257568
10 928047
11 3335267
12 11962223
13 42897410
14 153982177
15 553329976
16 1989825264
17 7158056447
18 25752911149
19 92656210922
20 333378246553
21 1199549630143
22 4316356194035
23 15532107553777

[6,36,157,558,1821,5951,20275,71653,257568,928047,
 3335267,11962223,42897410,153982177,553329976,
 1989825264,7158056447,25752911149,92656210922,
 333378246553,1199549630143,4316356194035,
 15532107553777]

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Last modified May 31 10:42 EDT 2020. Contains 334748 sequences. (Running on oeis4.)