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A237990 as a simple table

na(n)
14
28
316
420
540
644
756
864
972
1080
1192
1296
13108
14116
15120
16124
17132
18136
19140
20144
21148
22152
23156
24164
25176
26184
27188
28196
29200
30204
31208
32224
33232
34240
35252
36256
37264
38268
39272

[4,8,16,20,40,44,56,64,72,80,92,96,108,116,120,
 124,132,136,140,144,148,152,156,164,176,184,188,
 196,200,204,208,224,232,240,252,256,264,268,272]