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A304553
as a simple table
n
a(n)
1
0
2
3
3
29
4
578
5
22361
6
1640001
7
230504570
8
62711805029
9
33349745638405
10
34939148029874116
[0,3,29,578,22361,1640001,230504570,62711805029, 33349745638405,34939148029874116]