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A121982 as a simple table

na(n)
12
24
38
414
516
622
726
832
934
1038
1144
1246
1352
1464
1568
1676
1786
1888
1998
20104
21106
22124
23134
24158
25172
26178
27184
28196
29202
30206
31212
32236
33238
34242
35248
36256
37262
38272
39284
40296
41298
42304
43316
44322
45326
46328
47338
48356
49362
50364
51374
52386
53388
54394
55398
56452
57472

[2,4,8,14,16,22,26,32,34,38,44,46,52,64,68,76,86,
 88,98,104,106,124,134,158,172,178,184,196,202,206,
 212,236,238,242,248,256,262,272,284,296,298,304,
 316,322,326,328,338,356,362,364,374,386,388,394,
 398,452,472]