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A176995 as a simple table

na(n)
12
24
36
48
510
611
712
813
914
1015
1116
1217
1318
1419
1521
1622
1723
1824
1925
2026
2127
2228
2329
2430
2532
2633
2734
2835
2936
3037
3138
3239
3340
3441
3543
3644
3745
3846
3947
4048
4149
4250
4351
4452
4554
4655
4756
4857
4958
5059
5160
5261
5362
5463
5565
5666
5767
5868
5969
6070
6171
6272
6373
6474
6576
6677

[2,4,6,8,10,11,12,13,14,15,16,17,18,19,21,22,23,
 24,25,26,27,28,29,30,32,33,34,35,36,37,38,39,40,
 41,43,44,45,46,47,48,49,50,51,52,54,55,56,57,58,
 59,60,61,62,63,65,66,67,68,69,70,71,72,73,74,76,
 77]