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A218618 as a simple table

na(n)
00
11
2-1
31
4-1
53
61
7-1
83
95
10-1
111
12-1
133
145
15-1
16-7
171
181
193
201
21-1
223
235
24-1
25-7
261
271
283
29-7
301
311
32-5
331
34-5
35-3
36-1
371
38-1
393
405
41-1
42-7
431
441
453
46-7
471
481
49-5
501
51-5
52-3
53-1
54-7
551
561
57-5
581
5911
601
611
6213
631
64-5
65-1
663
671
68-1
693
705
71-1
72-7
731
741
753

[0,1,-1,1,-1,3,1,-1,3,5,-1,1,-1,3,5,-1,-7,1,1,3,1,
 -1,3,5,-1,-7,1,1,3,-7,1,1,-5,1,-5,-3,-1,1,-1,3,5,
 -1,-7,1,1,3,-7,1,1,-5,1,-5,-3,-1,-7,1,1,-5,1,11,1,
 1,13,1,-5,-1,3,1,-1,3,5,-1,-7,1,1,3]