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A368861 as a simple table

na(n)
12
24
36
48
510
612
714
816
918
1020
1122
1224
1326
1428
1530
1632
1734
1838
1942
2044
2148
2252
2356
2460
2562
2666
2768
2872
2988
3090
31118
32140
33166
34172
35178
36182
37188
38194
39200
40202
41206
42208
43210
44222
45228
46234
47240
48246
49250

[2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,
 38,42,44,48,52,56,60,62,66,68,72,88,90,118,140,
 166,172,178,182,188,194,200,202,206,208,210,222,
 228,234,240,246,250]