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A021824 as a simple table

n a(n)
0 1
1 20
2 267
3 3010
4 31073
5 304920
6 2901319
7 27075950
8 249555405
9 2281579300
10 20749095731
11 188036746170
12 1700122392697
13 15347941075760
14 138412864844703
15 1247405586235270
16 11236794818538149
17 101192043527859900

[1,20,267,3010,31073,304920,2901319,27075950,
 249555405,2281579300,20749095731,188036746170,
 1700122392697,15347941075760,138412864844703,
 1247405586235270,11236794818538149,
 101192043527859900]

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Last modified January 23 17:33 EST 2022. Contains 350514 sequences. (Running on oeis4.)