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A187339 as a simple table

na(n)
12
24
36
49
511
613
716
818
920
1023
1125
1227
1330
1432
1534
1636
1739
1841
1943
2046
2148
2250
2353
2455
2557
2660
2762
2864
2966
3069
3171
3273
3376
3478
3580
3683
3785
3887
3990
4092
4194
4296
4399
44101
45103
46106
47108
48110
49113
50115
51117
52120
53122
54124
55126
56129
57131
58133
59136
60138
61140
62143
63145

[2,4,6,9,11,13,16,18,20,23,25,27,30,32,34,36,39,
 41,43,46,48,50,53,55,57,60,62,64,66,69,71,73,76,
 78,80,83,85,87,90,92,94,96,99,101,103,106,108,110,
 113,115,117,120,122,124,126,129,131,133,136,138,
 140,143,145]