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A147394 as a simple table

na(n)
11
21
31
41
51
61
73
87
915
1027
1167
12281
131263
145491
1523639
16128337
17894617
187261755
1963564439
20605898697
216745478781
2288749999709
231352715152779

[1,1,1,1,1,1,3,7,15,27,67,281,1263,5491,23639,
 128337,894617,7261755,63564439,605898697,
 6745478781,88749999709,1352715152779]