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A165356
as a simple table
n
a(n)
1
3
2
19
3
211
4
1249
5
4513
6
1445953
7
30381331
8
286292179
9
2959257735801707821729
[3,19,211,1249,4513,1445953,30381331,286292179, 2959257735801707821729]