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A223218 as a simple table

na(n)
16
218
318
460
5126
660
7192
8918
9918
10192
11624
126642
1315498
146642
15624
162016
1748114
18254694
19254694
2048114
212016
226528
23348462
244232586
259640008
264232586
27348462
286528
2921120
302523798
3170014654
32367156350
33367156350
3470014654
352523798
3621120

[6,18,18,60,126,60,192,918,918,192,624,6642,15498,
 6642,624,2016,48114,254694,254694,48114,2016,6528,
 348462,4232586,9640008,4232586,348462,6528,21120,
 2523798,70014654,367156350,367156350,70014654,
 2523798,21120]