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A087633
as a simple table
n
a(n)
1
0
2
5
3
33
4
265
5
2087
6
17203
7
146439
8
1274154
9
11271147
10
101049993
11
915748570
12
8372464236
13
77114396969
[0,5,33,265,2087,17203,146439,1274154,11271147, 101049993,915748570,8372464236,77114396969]