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A146742 as a simple table

na(n)
11
21
31
41
51
61
73
87
915
1027
1147
12131
13579
142405
159787
1635829
17162637
18924049
196701259
2048977223
21381859081
223048055139
2330000129347

[1,1,1,1,1,1,3,7,15,27,47,131,579,2405,9787,35829,
 162637,924049,6701259,48977223,381859081,
 3048055139,30000129347]