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A006837
as a simple table
n
a(n)
2
0
3
1
4
0
5
3
6
1
7
0
8
21
9
-34
10
101
11
-249
12
921
13
-2524
14
5613
15
-8914
16
6206
[0,1,0,3,1,0,21,-34,101,-249,921,-2524,5613,-8914, 6206]