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A154870 as a simple table

na(n)
07
15
21
3-7
4-5
5-1
67
75
81
9-7
10-5
11-1
127
135
141
15-7
16-5
17-1
187
195
201
21-7
22-5
23-1
247
255
261
27-7
28-5
29-1
307
315
321
33-7
34-5
35-1
367
375
381
39-7
40-5
41-1
427
435
441
45-7
46-5
47-1
487
495
501
51-7
52-5
53-1
547
555
561
57-7
58-5
59-1
607
615
621
63-7
64-5
65-1
667
675
681
69-7
70-5
71-1
727
735
741
75-7
76-5
77-1
787
795
801
81-7
82-5
83-1
847
855
861

[7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,
 1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,1,-7,
 -5,-1,7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,1,-7,-5,
 -1,7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,5,1,-7,-5,-1,7,
 5,1,-7,-5,-1,7,5,1]