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A259609 as a simple table

na(n)
21
31
45
541
6438
75564
880237
91278297
1022108374
11410124999
128089569676
13168555880750
143691281132962
1584623035267642
162024303994864497
1750394612947711173
181302706707186206332
1934901118404682549804
20967494986526757083191
2127710705833750559374772
22818986747695251513692537

[1,1,5,41,438,5564,80237,1278297,22108374,
 410124999,8089569676,168555880750,3691281132962,
 84623035267642,2024303994864497,50394612947711173,
 1302706707186206332,34901118404682549804,
 967494986526757083191,27710705833750559374772,
 818986747695251513692537]