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A294385
as a simple table
n
a(n)
0
1
1
3
2
8
3
35
4
179
5
1079
6
7559
7
68038
8
680388
9
7484277
10
89811334
11
1167547353
12
16345662954
[1,3,8,35,179,1079,7559,68038,680388,7484277, 89811334,1167547353,16345662954]