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A357446
as a simple table
n
a(n)
2
0
3
0
4
0
5
2
6
5
7
34
8
212
9
1614
10
14059
11
144712
12
1726497
13
23550891
14
361098825
15
6137247735
[0,0,0,2,5,34,212,1614,14059,144712,1726497, 23550891,361098825,6137247735]