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A226720 as a simple table

na(n)
12
24
35
47
59
610
712
814
915
1017
1118
1220
1322
1423
1525
1627
1728
1830
1931
2033
2135
2236
2338
2440
2541
2643
2745
2846
2948
3049
3151
3253
3354
3456
3558
3659
3761
3862
3964
4066
4167
4269
4371
4472
4574
4676
4777
4879
4980
5082
5184
5285
5387
5489
5590
5692
5793
5895
5997
6098
61100
62102
63103
64105
65107

[2,4,5,7,9,10,12,14,15,17,18,20,22,23,25,27,28,30,
 31,33,35,36,38,40,41,43,45,46,48,49,51,53,54,56,
 58,59,61,62,64,66,67,69,71,72,74,76,77,79,80,82,
 84,85,87,89,90,92,93,95,97,98,100,102,103,105,107]