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A309718 as a simple table

na(n)
12
24
312
4100
5122
6130
7204
8206
9214
10326
11328
12330
13332
14356
15458
161024
171148
181190
191418
201474
211476
221500
231524
241630
251842
261948
272128
282130
292184
302436
312448
322536
332686
342688
352784
362796
372898
382980
393112
403562
413682
423806
433936
443944
454114
464318
474332
484364
494376
504412

[2,4,12,100,122,130,204,206,214,326,328,330,332,
 356,458,1024,1148,1190,1418,1474,1476,1500,1524,
 1630,1842,1948,2128,2130,2184,2436,2448,2536,2686,
 2688,2784,2796,2898,2980,3112,3562,3682,3806,3936,
 3944,4114,4318,4332,4364,4376,4412]