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A091165
as a simple table
n
a(n)
1
0
2
2
3
18
4
152
5
1189
6
9807
7
83003
8
719984
9
6355189
10
56878661
11
514751823
12
4700968833
13
43258135129
[0,2,18,152,1189,9807,83003,719984,6355189, 56878661,514751823,4700968833,43258135129]