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A325671 as a simple table

na(n)
1-3
21
3-2
44
5-8
616
7-32
864
9-128
10256
11-511
121012
13-1969
143718
15-6721
1611440
17-17875
1824310
19-24310
201
2192357
22-352484
23997568
24-2485241
255754023
26-12680954
2726924183
28-55410641
29110821282
30-215426354
31406270424
32-740354803
331294617071
34-2145852302

[-3,1,-2,4,-8,16,-32,64,-128,256,-511,1012,-1969,
 3718,-6721,11440,-17875,24310,-24310,1,92357,
 -352484,997568,-2485241,5754023,-12680954,
 26924183,-55410641,110821282,-215426354,406270424,
 -740354803,1294617071,-2145852302]