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A216781 as a simple table

na(n)
12
24
38
416
518
620
724
832
936
1040
1148
1250
1352
1464
1568
1672
1780
1888
1996
2098
21100
22104
23112
24116
25128
26136
27144
28148
29152
30160
31162
32164
33176
34180
35192
36196
37200
38208
39212
40224
41232
42240
43242
44244
45256
46272
47288
48292
49296
50304
51320
52324
53328
54338
55344
56352

[2,4,8,16,18,20,24,32,36,40,48,50,52,64,68,72,80,
 88,96,98,100,104,112,116,128,136,144,148,152,160,
 162,164,176,180,192,196,200,208,212,224,232,240,
 242,244,256,272,288,292,296,304,320,324,328,338,
 344,352]