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A280877 as a simple table

na(n)
12
24
36
48
510
612
714
815
916
1018
1120
1221
1322
1424
1526
1628
1730
1832
1933
2034
2136
2238
2340
2442
2544
2645
2746
2848
2950
3052
3154
3256
3358
3460
3562
3663
3764
3866
3968
4070
4172
4274
4375
4476
4578
4680
4782
4884
4986
5088
5190
5292
5394
5496
5598
5699
57100
58102
59104
60105
61106
62108
63110
64112
65114
66116
67118
68120
69122
70124
71126
72128

[2,4,6,8,10,12,14,15,16,18,20,21,22,24,26,28,30,
 32,33,34,36,38,40,42,44,45,46,48,50,52,54,56,58,
 60,62,63,64,66,68,70,72,74,75,76,78,80,82,84,86,
 88,90,92,94,96,98,99,100,102,104,105,106,108,110,
 112,114,116,118,120,122,124,126,128]