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A246446
as a simple table
n
a(n)
1
0
2
2
3
3
4
8
5
26
6
108
7
661
8
6150
9
97585
10
2700050
11
135841840
12
12568984762
13
2179513027405
[0,2,3,8,26,108,661,6150,97585,2700050,135841840, 12568984762,2179513027405]