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A168380 as a simple table

na(n)
12
24
312
420
538
656
788
8120
9170
10220
11292
12364
13462
14560
15688
16816
17978
181140
191340
201540
211782
222024
232312
242600
252938
263276
273668
284060
294510
304960
315472
325984
336562
347140
357788
368436
379158
389880
3910680
4011480
4112362
4213244
4314212
4415180
4516238
4617296
4718448
4819600
4920850
5022100

[2,4,12,20,38,56,88,120,170,220,292,364,462,560,
 688,816,978,1140,1340,1540,1782,2024,2312,2600,
 2938,3276,3668,4060,4510,4960,5472,5984,6562,7140,
 7788,8436,9158,9880,10680,11480,12362,13244,14212,
 15180,16238,17296,18448,19600,20850,22100]