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A087254 as a simple table

na(n)
14
28
320
424
532
648
756
868
972
1080
1184
1296
13104
14116
15128
16132
17144
18152
19168
20176
21180
22192
23200
24212
25224
26228
27240
28260
29264
30272
31276
32288
33296
34308
35312
36320
37324
38336
39344
40356
41360
42368
43372
44384
45392
46404
47408
48416
49452
50456
51464
52468
53480
54488
55512

[4,8,20,24,32,48,56,68,72,80,84,96,104,116,128,
 132,144,152,168,176,180,192,200,212,224,228,240,
 260,264,272,276,288,296,308,312,320,324,336,344,
 356,360,368,372,384,392,404,408,416,452,456,464,
 468,480,488,512]