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A293883 as a simple table

na(n)
21
33
48
520
647
7106
8237
9522
101146
112485
125406
1311644
1425157
1553964
16116003
17247987
18530999
191131889
202415431
215135838
2210927816
2323182209
2449199697
25104154808
26220543306
27465996956
28984704338
292076988457
304380764354
319225209588
3219424813915
3340844509107

[1,3,8,20,47,106,237,522,1146,2485,5406,11644,
 25157,53964,116003,247987,530999,1131889,2415431,
 5135838,10927816,23182209,49199697,104154808,
 220543306,465996956,984704338,2076988457,
 4380764354,9225209588,19424813915,40844509107]