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A007731 as a simple table

na(n)
01
13
25
37
49
59
615
715
817
919
1019
1119
1229
1329
1429
1529
1631
1731
1841
1941
2041
2141
2241
2341
2455
2555
2655
2757
2857
2957
3057
3157
3259
3359
3459
3559
3685
3785
3885
3985
4085
4185
4285
4385
4485
4585
4685
4785
48103
49103
50103
51103
52103
53103
54117
55117

[1,3,5,7,9,9,15,15,17,19,19,19,29,29,29,29,31,31,
 41,41,41,41,41,41,55,55,55,57,57,57,57,57,59,59,
 59,59,85,85,85,85,85,85,85,85,85,85,85,85,103,103,
 103,103,103,103,117,117]