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A003168 as a simple table

n a(n)
0 1
1 1
2 4
3 21
4 126
5 818
6 5594
7 39693
8 289510
9 2157150
10 16348960
11 125642146
12 976789620
13 7668465964
14 60708178054
15 484093913917
16 3884724864390
17 31348290348086
18 254225828706248
19 2070856216759478
20 16936016649259364

[1,1,4,21,126,818,5594,39693,289510,2157150,
 16348960,125642146,976789620,7668465964,
 60708178054,484093913917,3884724864390,
 31348290348086,254225828706248,2070856216759478,
 16936016649259364]

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)