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A018191 as a simple table

n a(n)
1 1
2 2
3 5
4 16
5 53
6 206
7 817
8 3620
9 16361
10 80218
11 401501
12 2139512
13 11641885
14 66599846
15 388962953
16 2367284236
17 14700573137
18 94523836850
19 619674301621
20 4186249123808
21 28809504493061
22 203556335785342
23 1463877667140065
24 10777146970619636
25 80686484464418233

[1,2,5,16,53,206,817,3620,16361,80218,401501,
 2139512,11641885,66599846,388962953,2367284236,
 14700573137,94523836850,619674301621,
 4186249123808,28809504493061,203556335785342,
 1463877667140065,10777146970619636,
 80686484464418233]

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Last modified August 5 20:57 EDT 2021. Contains 346488 sequences. (Running on oeis4.)