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A340355 as a simple table

n a(n)
0 1
1 1
2 4
3 15
4 73
5 373
6 2036
7 11518
8 67108
9 399596
10 2421477
11 14883232
12 92561649
13 581401130
14 3683031612
15 23502839520
16 150944260610
17 974905750378
18 6328238976958
19 41261578774953
20 270119042203681
21 1774773646080126
22 11699419572947070
23 77355905980770122
24 512885661648043804

[1,1,4,15,73,373,2036,11518,67108,399596,2421477,
 14883232,92561649,581401130,3683031612,
 23502839520,150944260610,974905750378,
 6328238976958,41261578774953,270119042203681,
 1774773646080126,11699419572947070,
 77355905980770122,512885661648043804]

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Last modified December 4 09:27 EST 2022. Contains 358556 sequences. (Running on oeis4.)