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A186387 as a simple table

na(n)
13
26
38
410
512
613
715
817
918
1020
1121
1223
1324
1426
1527
1629
1730
1832
1933
2034
2136
2237
2339
2440
2541
2643
2744
2845
2947
3048
3149
3251
3352
3453
3554
3656
3757
3858
3960
4061
4162
4263
4365
4466
4567
4668
4770
4871
4972
5073
5175
5276
5377
5478
5580
5681
5782
5883
5985
6086
6187
6288
6389
6491
6592

[3,6,8,10,12,13,15,17,18,20,21,23,24,26,27,29,30,
 32,33,34,36,37,39,40,41,43,44,45,47,48,49,51,52,
 53,54,56,57,58,60,61,62,63,65,66,67,68,70,71,72,
 73,75,76,77,78,80,81,82,83,85,86,87,88,89,91,92]