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A181665 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 17
5 51
6 161
7 519
8 1707
9 5711
10 19358
11 66342
12 229505
13 800333
14 2810370
15 9928806
16 35266403
17 125863071
18 451119566
19 1623142622
20 5860507205
21 21227095355
22 77108788287
23 280847802645
24 1025416658863
25 3752414144071
26 13760368353098

[1,1,2,6,17,51,161,519,1707,5711,19358,66342,
 229505,800333,2810370,9928806,35266403,125863071,
 451119566,1623142622,5860507205,21227095355,
 77108788287,280847802645,1025416658863,
 3752414144071,13760368353098]

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Last modified July 29 05:20 EDT 2021. Contains 346340 sequences. (Running on oeis4.)