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A115275 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 14
5 51
6 187
7 820
8 3670
9 18191
10 97917
11 554500
12 3334465
13 20871592
14 138440031
15 972083845
16 6985171390
17 52194795327
18 412903730293
19 3313067916192
20 28017395030419
21 241504438776956
22 2189375704925081
23 19771679215526507
24 187677937412341677

[1,1,2,5,14,51,187,820,3670,18191,97917,554500,
 3334465,20871592,138440031,972083845,6985171390,
 52194795327,412903730293,3313067916192,
 28017395030419,241504438776956,2189375704925081,
 19771679215526507,187677937412341677]

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Last modified January 27 14:39 EST 2020. Contains 331295 sequences. (Running on oeis4.)