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A047710 as a simple table

na(n)
10
2-4
38
436
5-144
6236
7-328
8580
9-1088
101836
11-3096
125668
13-10736
1420668
15-40328

[0,-4,8,36,-144,236,-328,580,-1088,1836,-3096,
 5668,-10736,20668,-40328]