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A146726 as a simple table

na(n)
11
21
31
41
51
61
73
87
915
1027
1151
12141
13615
142523
1510593
1640853
17196793
181114237
198094209
2059485011
21492771709
224132732207
2342832582765
24478558556527

[1,1,1,1,1,1,3,7,15,27,51,141,615,2523,10593,
 40853,196793,1114237,8094209,59485011,492771709,
 4132732207,42832582765,478558556527]