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A025594 as a simple table

n a(n)
0 0
1 1
2 6
3 43
4 324
5 2565
6 21202
7 181071
8 1583440
9 14074121
10 126458750
11 1144310003
12 10401799580
13 94825890253
14 866041203690
15 7918632503383
16 72456324725928
17 663284620905297
18 6073618350612502
19 55625356328239995
20 509503126813055092
21 4667146731457616789

[0,1,6,43,324,2565,21202,181071,1583440,14074121,
 126458750,1144310003,10401799580,94825890253,
 866041203690,7918632503383,72456324725928,
 663284620905297,6073618350612502,
 55625356328239995,509503126813055092,
 4667146731457616789]

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Last modified May 17 14:19 EDT 2022. Contains 353746 sequences. (Running on oeis4.)