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A147973 as a simple table

na(n)
1-4
22
34
42
5-4
6-14
7-28
8-46
9-68
10-94
11-124
12-158
13-196
14-238
15-284
16-334
17-388
18-446
19-508
20-574
21-644
22-718
23-796
24-878
25-964
26-1054
27-1148
28-1246
29-1348
30-1454
31-1564
32-1678
33-1796
34-1918
35-2044
36-2174
37-2308
38-2446
39-2588
40-2734
41-2884

[-4,2,4,2,-4,-14,-28,-46,-68,-94,-124,-158,-196,
 -238,-284,-334,-388,-446,-508,-574,-644,-718,-796,
 -878,-964,-1054,-1148,-1246,-1348,-1454,-1564,
 -1678,-1796,-1918,-2044,-2174,-2308,-2446,-2588,
 -2734,-2884]