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A298773 as a simple table

na(n)
15
249
3109
4779
52603
611320
761333
8284618
91376511
106959439
1134511708
12170670413
13851900683
144250558598
1521161145459
16105481131616
17526133966100
182623203957029
1913078950820473
2065224465637861
21325269426017123

[5,49,109,779,2603,11320,61333,284618,1376511,
 6959439,34511708,170670413,851900683,4250558598,
 21161145459,105481131616,526133966100,
 2623203957029,13078950820473,65224465637861,
 325269426017123]