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A222012 as a simple table

n a(n)
0 1
1 1
2 4
3 22
4 145
5 1081
6 8863
7 78751
8 752587
9 7708483
10 84532222
11 992628616
12 12487788067
13 168344145919
14 2430351826084
15 37517872149790
16 617842147959019
17 10821864145358779
18 200955801421862020
19 3943205940005194330
20 81506338541922078355
21 1769606318933022398611

[1,1,4,22,145,1081,8863,78751,752587,7708483,
 84532222,992628616,12487788067,168344145919,
 2430351826084,37517872149790,617842147959019,
 10821864145358779,200955801421862020,
 3943205940005194330,81506338541922078355,
 1769606318933022398611]

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Last modified September 23 19:41 EDT 2020. Contains 337315 sequences. (Running on oeis4.)