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A247992 as a simple table

na(n)
128020
2104620
3397988
41530604
55921416
622963328
789060732
8346013066
91346084716
105240401580
1120406756920
1279463967682
13309399561806
141204908994782
154693322353852
1618283236550554
1771224850307312

[28020,104620,397988,1530604,5921416,22963328,
 89060732,346013066,1346084716,5240401580,
 20406756920,79463967682,309399561806,
 1204908994782,4693322353852,18283236550554,
 71224850307312]