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A336021 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 2
7 5
8 15
9 52
10 204
11 902
12 4532
13 26196
14 175320
15 1351296
16 11819348
17 115309534
18 1236465988
19 14419850138
20 181652022376
21 2462053028798
22 35834756184146
23 559816444117400
24 9389648056139010
25 169166236946379128
26 3273760080403458226
27 67994123544008546820

[1,1,1,1,1,1,2,5,15,52,204,902,4532,26196,175320,
 1351296,11819348,115309534,1236465988,14419850138,
 181652022376,2462053028798,35834756184146,
 559816444117400,9389648056139010,
 169166236946379128,3273760080403458226,
 67994123544008546820]

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Last modified April 16 03:59 EDT 2021. Contains 343030 sequences. (Running on oeis4.)