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A146228 as a simple table

na(n)
11
21
31
41
51
61
73
87
915
1027
1153
12167
13715
143083
1512351
1650227
17261707
181665665
1912424027
2097246107
21810664323
227548517875
2383664650731
241054301327283

[1,1,1,1,1,1,3,7,15,27,53,167,715,3083,12351,
 50227,261707,1665665,12424027,97246107,810664323,
 7548517875,83664650731,1054301327283]