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A197651
as a simple table
n
a(n)
1
1
2
7
3
25
4
279
5
15573
6
403867
7
64115297
8
13562905311
9
4563971866877
10
5430296531364427
11
7765379732369266217
[1,7,25,279,15573,403867,64115297,13562905311, 4563971866877,5430296531364427, 7765379732369266217]