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A223352 as a simple table

na(n)
16
212
312
428
552
628
760
8236
9236
1060
11140
121076
132280
141076
15140
16300
174908
1820836
1920836
204908
21300
22700
2322388
24202264
25405988
26202264
2722388
28700
291500
30102124
311851020
327918948
337918948
341851020
35102124
361500
373500
38465844
3917970056

[6,12,12,28,52,28,60,236,236,60,140,1076,2280,
 1076,140,300,4908,20836,20836,4908,300,700,22388,
 202264,405988,202264,22388,700,1500,102124,
 1851020,7918948,7918948,1851020,102124,1500,3500,
 465844,17970056]