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A146638 as a simple table

na(n)
11
21
31
41
51
61
71
83
99
1019
1133
1257
13181
14727
153143
1612709
1746177
18203713
191168453
207869343
2157494841
22429662591
233357500475

[1,1,1,1,1,1,1,3,9,19,33,57,181,727,3143,12709,
 46177,203713,1168453,7869343,57494841,429662591,
 3357500475]