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A047710
as a simple table
n
a(n)
1
0
2
-4
3
8
4
36
5
-144
6
236
7
-328
8
580
9
-1088
10
1836
11
-3096
12
5668
13
-10736
14
20668
15
-40328
[0,-4,8,36,-144,236,-328,580,-1088,1836,-3096, 5668,-10736,20668,-40328]