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A138970 as a simple table

na(n)
12
25
36
49
511
612
715
817
920
1023
1124
1225
1328
1429
1532
1634
1736
1839
1941
2043
2144
2249
2350
2452
2554
2656
2758
2859
2961
3064
3165
3267
3369
3470
3573
3676
3777
3878
3979
4081
4183
4286
4387
4488
4596
4697
4799
48101
49103
50105
51107
52109
53111
54112
55115
56118
57120
58121
59122
60125
61126
62129
63133
64134
65135

[2,5,6,9,11,12,15,17,20,23,24,25,28,29,32,34,36,
 39,41,43,44,49,50,52,54,56,58,59,61,64,65,67,69,
 70,73,76,77,78,79,81,83,86,87,88,96,97,99,101,103,
 105,107,109,111,112,115,118,120,121,122,125,126,
 129,133,134,135]