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A219973 as a simple table

n a(n)
0 1
1 1
2 5
3 35
4 165
5 1177
6 9407
7 55657
8 372429
9 2766100
10 17671945
11 118674685
12 837152398
13 5531816082
14 37328192350
15 257252634864
16 1725117502706
17 11666552132346
18 79612474584518
19 537157628862720
20 3636277021289585
21 24711657036469040
22 167150255133278869

[1,1,5,35,165,1177,9407,55657,372429,2766100,
 17671945,118674685,837152398,5531816082,
 37328192350,257252634864,1725117502706,
 11666552132346,79612474584518,537157628862720,
 3636277021289585,24711657036469040,
 167150255133278869]

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Last modified July 1 22:23 EDT 2022. Contains 354984 sequences. (Running on oeis4.)