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A288475 as a simple table

na(n)
12
24
36
47
59
610
712
814
916
1017
1119
1220
1322
1424
1526
1627
1729
1830
1933
2034
2136
2237
2339
2441
2543
2644
2746
2847
2950
3051
3153
3254
3356
3458
3560
3661
3763
3864
3966
4068
4170
4271
4373
4474
4576
4678
4780
4881
4983
5084
5187
5288
5390
5491
5593
5695
5797
5898
59100
60101
61104
62105
63107
64108

[2,4,6,7,9,10,12,14,16,17,19,20,22,24,26,27,29,30,
 33,34,36,37,39,41,43,44,46,47,50,51,53,54,56,58,
 60,61,63,64,66,68,70,71,73,74,76,78,80,81,83,84,
 87,88,90,91,93,95,97,98,100,101,104,105,107,108]