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A138871 as a simple table

na(n)
12
24
316
464
596
6536
7144
8824
9976
1056
1164
12864
13576
1464
15544
16504
17176
18536
19496
20304
2156
22776
2396
24736
25376
26256
27336
28104
29504
30656
31224
32944
33296
34264
35856
36576
37136
38896
39536
4024
41704
42624
43936
44936
45464
46376
47256
48976

[2,4,16,64,96,536,144,824,976,56,64,864,576,64,
 544,504,176,536,496,304,56,776,96,736,376,256,336,
 104,504,656,224,944,296,264,856,576,136,896,536,
 24,704,624,936,936,464,376,256,976]