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A266902
as a simple table
n
a(n)
1
1
2
0
3
1
4
13
5
331
6
17651
7
1386377
8
148410280
9
20588092054
10
3584553946578
11
764734875953730
12
196150243865801221
[1,0,1,13,331,17651,1386377,148410280,20588092054, 3584553946578,764734875953730,196150243865801221]