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A040175
as a simple table
n
a(n)
3
3
4
9
5
57
6
318
7
3090
8
24666
9
234879
10
2381481
11
26777922
12
324421053
13
4265966685
[3,9,57,318,3090,24666,234879,2381481,26777922, 324421053,4265966685]