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A198040
as a simple table
n
a(n)
1
1
2
1
3
1
4
25
5
121
6
409
7
28601
8
2265417
9
65067529
10
5916637353
11
2741353552969
12
803210214721929
[1,1,1,25,121,409,28601,2265417,65067529, 5916637353,2741353552969,803210214721929]