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A121688 as a simple table

n a(n)
0 1
1 2
2 3
3 6
4 15
5 49
6 210
7 1191
8 8981
9 90405
10 1219297
11 22105506
12 540476679
13 17875316557
14 802011318369
15 48947781204529
16 4073596070782653
17 463360670014324153
18 72183972733773232361
19 15430254274957714069057

[1,2,3,6,15,49,210,1191,8981,90405,1219297,
 22105506,540476679,17875316557,802011318369,
 48947781204529,4073596070782653,
 463360670014324153,72183972733773232361,
 15430254274957714069057]

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Last modified June 14 08:31 EDT 2021. Contains 345018 sequences. (Running on oeis4.)