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A305361
as a simple table
n
a(n)
1
0
2
7
3
39
4
398
5
7196
6
179644
7
8803975
8
615439372
9
69977566829
10
13294810916472
[0,7,39,398,7196,179644,8803975,615439372, 69977566829,13294810916472]