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A134747 as a simple table

na(n)
11
2-8
328
4-64
5142
6-352
7792
8-1536
92917
10-5744
1110868
12-19200
1333414
14-58816
15101256
16-167936
17275314
18-452392
19732748
20-1160064
211819808
22-2851104
234421064
24-6752256
2510236407
26-15476272
2723215192
28-34450944
2950811638
30-74701632
31109138272
32-158171136

[1,-8,28,-64,142,-352,792,-1536,2917,-5744,10868,
 -19200,33414,-58816,101256,-167936,275314,-452392,
 732748,-1160064,1819808,-2851104,4421064,-6752256,
 10236407,-15476272,23215192,-34450944,50811638,
 -74701632,109138272,-158171136]