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A321704 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 118
5 895
6 8151
7 83916
8 977026
9 12602451
10 178880725
11 2766415036
12 46314488705
13 834067614601
14 16074694453741
15 330017679352180
16 7188779521480810 

[1,1,4,18,118,895,8151,83916,977026,12602451,
 178880725,2766415036,46314488705,834067614601,
 16074694453741,330017679352180,7188779521480810]

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Last modified June 10 16:48 EDT 2023. Contains 363205 sequences. (Running on oeis4.)