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A338312 as a simple table

na(n)
14
28
310
420
540
644
7104
8136
9152
10170
11190
12232
13260
14286
15442
16580
17740
18836
19890
201364
211378
221990
232204
242260
252584
262626
272684
282834
293016
303160
313230
323926
334220
344636
355662
366290
377208
387384
397540
407676
417964
428294
438420
449164
459316
469320
4710070
4811476

[4,8,10,20,40,44,104,136,152,170,190,232,260,286,
 442,580,740,836,890,1364,1378,1990,2204,2260,2584,
 2626,2684,2834,3016,3160,3230,3926,4220,4636,5662,
 6290,7208,7384,7540,7676,7964,8294,8420,9164,9316,
 9320,10070,11476]