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A053228 as a simple table

na(n)
12
24
36
48
510
612
714
816
918
1020
1122
1224
1326
1428
1530
1632
1734
1836
1938
2040
2142
2246
2348
2450
2552
2654
2756
2858
2960
3062
3164
3266
3368
3470
3572
3674
3776
3878
3980
4082
4184
4286
4388
4490
4592
4694
4796
4898
49100
50102
51106
52108
53110
54112
55114
56116
57118
58120
59122
60124
61126
62128
63130
64132

[2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,
 36,38,40,42,46,48,50,52,54,56,58,60,62,64,66,68,
 70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,
 102,106,108,110,112,114,116,118,120,122,124,126,
 128,130,132]