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A064720 as a simple table

na(n)
12
24
36
48
510
612
714
816
918
1020
1123
1225
1327
1429
1531
1633
1735
1837
1939
2041
2144
2246
2348
2450
2552
2654
2756
2858
2960
3062
3165
3267
3369
3471
3573
3675
3777
3879
3981
4083
4186
4288
4390
4492
4594
4696
4798
48100
49102
50104
51107
52109
53111
54113
55115
56117
57119
58121
59123
60125
61128
62130
63132
64134

[2,4,6,8,10,12,14,16,18,20,23,25,27,29,31,33,35,
 37,39,41,44,46,48,50,52,54,56,58,60,62,65,67,69,
 71,73,75,77,79,81,83,86,88,90,92,94,96,98,100,102,
 104,107,109,111,113,115,117,119,121,123,125,128,
 130,132,134]