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A168276 as a simple table

na(n)
12
22
36
46
510
610
714
814
918
1018
1122
1222
1326
1426
1530
1630
1734
1834
1938
2038
2142
2242
2346
2446
2550
2650
2754
2854
2958
3058
3162
3262
3366
3466
3570
3670
3774
3874
3978
4078
4182
4282
4386
4486
4590
4690
4794
4894
4998
5098
51102
52102
53106
54106
55110
56110
57114
58114
59118
60118
61122
62122
63126
64126
65130
66130

[2,2,6,6,10,10,14,14,18,18,22,22,26,26,30,30,34,
 34,38,38,42,42,46,46,50,50,54,54,58,58,62,62,66,
 66,70,70,74,74,78,78,82,82,86,86,90,90,94,94,98,
 98,102,102,106,106,110,110,114,114,118,118,122,
 122,126,126,130,130]