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A221921 as a simple table

na(n)
42
520
612
728
88
936
1020
1144
123
1352
1428
1560
1616
1768
1836
1976
2010
2184
2244
2392
2424
25100
2652
27108
287
29116
3060
31124
3232
33132
3468
35140
3618
37148
3876
39156
4040
41164
4284
43172
4411
45180
4692
47188
4848
49196
50100
51204
5226
53212
54108
55220
5656
57228
58116
59236
6015
61244
62124
63252
6464

[2,20,12,28,8,36,20,44,3,52,28,60,16,68,36,76,10,
 84,44,92,24,100,52,108,7,116,60,124,32,132,68,140,
 18,148,76,156,40,164,84,172,11,180,92,188,48,196,
 100,204,26,212,108,220,56,228,116,236,15,244,124,
 252,64]