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A006804
as a simple table
n
a(n)
0
3
1
-3
2
12
3
-21
4
55
5
-114
6
273
7
-611
8
1437
9
-3300
10
7714
11
-17913
[3,-3,12,-21,55,-114,273,-611,1437,-3300,7714, -17913]