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A188047 as a simple table

na(n)
12
24
36
412
516
620
722
834
936
1042
1152
1256
1358
1460
1566
1672
1778
1884
1986
2088
2190
2292
2394
2496
25102
26104
27106
28108
29110
30112
31114
32128
33138
34140
35142
36144
37156
38158

[2,4,6,12,16,20,22,34,36,42,52,56,58,60,66,72,78,
 84,86,88,90,92,94,96,102,104,106,108,110,112,114,
 128,138,140,142,144,156,158]