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A059804 as a simple table

na(n)
21
33
49
539
687
7215
8391
9711
101326
111975
122925
134256
145696
157537
169774
1712488
1816322
1920477
2024966
2130007
2235336
2341577
2448466
2556387
2665796
2775997
2886606
2998055
30109936
31122705
32138834
33155995
34174764
35194085
36216286
37239087
38263736
39290305

[1,3,9,39,87,215,391,711,1326,1975,2925,4256,5696,
 7537,9774,12488,16322,20477,24966,30007,35336,
 41577,48466,56387,65796,75997,86606,98055,109936,
 122705,138834,155995,174764,194085,216286,239087,
 263736,290305]