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A087630
as a simple table
n
a(n)
1
0
2
5
3
35
4
266
5
2081
6
17230
7
146487
8
1274194
9
11271088
10
101050133
11
915755611
12
8372443850
13
77114409020
[0,5,35,266,2081,17230,146487,1274194,11271088, 101050133,915755611,8372443850,77114409020]