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A238311 as a simple table

na(n)
1256
21776
31776
412372
520128
612372
785984
8227622
9227622
1085984
11601408
122570594
134124382
142570594
15601408
164181152
1729039618
1873547936
1973547936
2029039618
214181152
2229228452
23328887234
241325192097
252095353404
261325192097

[256,1776,1776,12372,20128,12372,85984,227622,
 227622,85984,601408,2570594,4124382,2570594,
 601408,4181152,29039618,73547936,73547936,
 29039618,4181152,29228452,328887234,1325192097,
 2095353404,1325192097]