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A214822
as a simple table
n
a(n)
1
0
2
0
3
1
4
6
5
30
6
211
7
1350
8
9636
9
69169
10
513012
11
3843024
12
29107494
[0,0,1,6,30,211,1350,9636,69169,513012,3843024, 29107494]