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A320021 as a simple table

na(n)
15
26
37
48
535
640
751
8237
9263
10264
11280
12387
13899
141300
157300
168363
178364
1811764
1926740
2026939
2146595
2259004
2380877
24131580
255244549
265462385
2717062317
2875097524
29127838820
30323987589
311162300835
321381439877
334943600220

[5,6,7,8,35,40,51,237,263,264,280,387,899,1300,
 7300,8363,8364,11764,26740,26939,46595,59004,
 80877,131580,5244549,5462385,17062317,75097524,
 127838820,323987589,1162300835,1381439877,
 4943600220]