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A020129 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 5
5 21
6 109
7 695
8 5143
9 43194
10 406017
11 4222570
12 48137292
13 596902409
14 7998492274
15 115178288737
16 1773745646540
17 29089428603256
18 506156057696642
19 9313271461618196
20 180677466355392996
21 3685820313650017112

[1,1,1,2,5,21,109,695,5143,43194,406017,4222570,
 48137292,596902409,7998492274,115178288737,
 1773745646540,29089428603256,506156057696642,
 9313271461618196,180677466355392996,
 3685820313650017112]

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Last modified March 22 12:23 EDT 2019. Contains 321421 sequences. (Running on oeis4.)