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A243244
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
4
6
30
7
317
8
5511
9
165165
10
8932499
11
870814993
12
153082769374
13
48887756906623
[0,0,0,1,4,30,317,5511,165165,8932499,870814993, 153082769374,48887756906623]