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A321111 as a simple table

n a(n)
4 4
5 20
6 108
7 586
8 3098
9 16230
10 85150
11 446972
12 2349616
13 12376800
14 65353448
15 345933358
16 1835637246
17 9764363438
18 52064375292
19 278256581910
20 1490475179006
21 8000983513636
22 43039329754332
23 231982689315468
24 1252791611642654
25 6777998215153164
26 36735901427197962

[4,20,108,586,3098,16230,85150,446972,2349616,
 12376800,65353448,345933358,1835637246,9764363438,
 52064375292,278256581910,1490475179006,
 8000983513636,43039329754332,231982689315468,
 1252791611642654,6777998215153164,
 36735901427197962]

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Last modified August 13 11:26 EDT 2022. Contains 356080 sequences. (Running on oeis4.)