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A251237 as a simple table

na(n)
12
24
36
48
510
612
714
816
918
1020
1125
1227
1329
1431
1533
1635
1737
1839
1941
2044
2146
2248
2350
2452
2554
2656
2758
2860
2963
3065
3167
3269
3371
3473
3575
3677
3780
3882
3984
4086
4189
4291
4393
4495
4597
4699
47102
48104
49106
50108
51110
52112
53115
54117
55119
56121
57123
58125
59128
60130
61133
62135

[2,4,6,8,10,12,14,16,18,20,25,27,29,31,33,35,37,
 39,41,44,46,48,50,52,54,56,58,60,63,65,67,69,71,
 73,75,77,80,82,84,86,89,91,93,95,97,99,102,104,
 106,108,110,112,115,117,119,121,123,125,128,130,
 133,135]