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A197663
as a simple table
n
a(n)
1
1
2
1
3
13
4
49
5
567
6
15412
7
329372
8
21751339
9
2108724044
10
293878982370
11
87209877288093
12
39253957174939181
[1,1,13,49,567,15412,329372,21751339,2108724044, 293878982370,87209877288093,39253957174939181]