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A260391 as a simple table

na(n)
12
24
36
48
510
614
716
818
920
1022
1124
1226
1328
1430
1532
1634
1738
1840
1942
2044
2146
2250
2352
2454
2556
2658
2762
2864
2966
3068
3170
3272
3374
3476
3578
3680
3782
3886
3988
4090
4192
4294
4396
4498
45100
46102
47104
48106
49110
50112
51114
52116
53118
54120
55122
56124
57126
58128
59130
60134
61136

[2,4,6,8,10,14,16,18,20,22,24,26,28,30,32,34,38,
 40,42,44,46,50,52,54,56,58,62,64,66,68,70,72,74,
 76,78,80,82,86,88,90,92,94,96,98,100,102,104,106,
 110,112,114,116,118,120,122,124,126,128,130,134,
 136]