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A168653 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 21
5 82
6 340
7 1478
8 6622
9 30433
10 142331
11 676203
12 3248579
13 15776459
14 77196573
15 380849394
16 1888606247
17 9430534212
18 47236684433
19 238214461960
20 1202007809362
21 6116704517639
22 30997312336216
23 159384351652358

[1,1,2,6,21,82,340,1478,6622,30433,142331,676203,
 3248579,15776459,77196573,380849394,1888606247,
 9430534212,47236684433,238214461960,1202007809362,
 6116704517639,30997312336216,159384351652358]

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Last modified June 22 10:56 EDT 2021. Contains 345375 sequences. (Running on oeis4.)