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A221704 as a simple table

n a(n)
2 20
3 96
4 440
5 1956
6 8522
7 36616
8 155748
9 657468
10 2759040
11 11523584
12 47944480
13 198834824
14 822365998
15 3393330152
16 13973673788
17 57441828332
18 235759507928
19 966292212992
20 3955570350128
21 16174269135992
22 66069496614548
23 269635886185424
24 1099484607270920
25 4479870682221016
26 18240349141736352
27 74219083904054016
28 301810005706454016

[20,96,440,1956,8522,36616,155748,657468,2759040,
 11523584,47944480,198834824,822365998,3393330152,
 13973673788,57441828332,235759507928,966292212992,
 3955570350128,16174269135992,66069496614548,
 269635886185424,1099484607270920,4479870682221016,
 18240349141736352,74219083904054016,
 301810005706454016]

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Last modified September 27 22:01 EDT 2022. Contains 357063 sequences. (Running on oeis4.)