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A307725 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 8
5 38
6 234
7 1670
8 13730
9 126050
10 1286506
11 14374806
12 174922742
13 2299332974
14 32498831162
15 491302184254
16 7913576956058
17 135291701108082
18 2447171221364738
19 46693007367175606
20 937331324424610142
21 19748487304680389214
22 435735970210393888898
23 10048153760813576981702

[0,1,1,2,8,38,234,1670,13730,126050,1286506,
 14374806,174922742,2299332974,32498831162,
 491302184254,7913576956058,135291701108082,
 2447171221364738,46693007367175606,
 937331324424610142,19748487304680389214,
 435735970210393888898,10048153760813576981702]

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Last modified September 22 16:41 EDT 2019. Contains 327311 sequences. (Running on oeis4.)