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A278791
as a simple table
n
a(n)
1
0
2
7
3
127
4
1520
5
17041
6
182417
7
1905514
8
19609185
9
199884780
10
2024660098
11
20422230540
[0,7,127,1520,17041,182417,1905514,19609185, 199884780,2024660098,20422230540]