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A002469 as a simple table

n a(n)
2 0
3 0
4 1
5 5
6 31
7 203
8 1501
9 12449
10 114955
11 1171799
12 13082617
13 158860349
14 2085208951
15 29427878435
16 444413828821
17 7151855533913
18 122190894996451
19 2209057440250799
20 42133729714051825
21 845553296311189109
22 17810791160738752207
23 392911423093684031099

[0,0,1,5,31,203,1501,12449,114955,1171799,
 13082617,158860349,2085208951,29427878435,
 444413828821,7151855533913,122190894996451,
 2209057440250799,42133729714051825,
 845553296311189109,17810791160738752207,
 392911423093684031099]

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Last modified September 21 01:52 EDT 2020. Contains 337266 sequences. (Running on oeis4.)