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A220772 as a simple table

n a(n)
0 1
1 4
2 21
3 54
4 343
5 1225
6 7104
7 31777
8 169952
9 819260
10 4234749
11 21008157
12 107087889
13 536982808
14 2721665059
15 13704483996
16 69301052416
17 349520578291
18 1765820428959
19 8911657997748
20 45005845549969
21 227191526564923
22 1147192132487813
23 5791672997769659

[1,4,21,54,343,1225,7104,31777,169952,819260,
 4234749,21008157,107087889,536982808,2721665059,
 13704483996,69301052416,349520578291,
 1765820428959,8911657997748,45005845549969,
 227191526564923,1147192132487813,5791672997769659]

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Last modified August 4 05:02 EDT 2021. Contains 346442 sequences. (Running on oeis4.)