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A026620 as a simple table

na(n)
21
39
437
5147
6576
72244
88723
933891
10131716
11512278
121994202
137770734
1430310320
15118343970
16462501135
171809134115
187082699580
1927750808470
20108812919270
21426966196410
221676471166240
236586744582080
2425894139638302
25101852815940622
26400840469986376
271578280410414204

[1,9,37,147,576,2244,8723,33891,131716,512278,
 1994202,7770734,30310320,118343970,462501135,
 1809134115,7082699580,27750808470,108812919270,
 426966196410,1676471166240,6586744582080,
 25894139638302,101852815940622,400840469986376,
 1578280410414204]