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A146598 as a simple table

na(n)
11
21
31
41
51
61
71
83
97
1015
1131
1271
13203
14581
152061
168089
1733693
18163089
19819567
204807311
2130022515
22215155907
231673895429

[1,1,1,1,1,1,1,3,7,15,31,71,203,581,2061,8089,
 33693,163089,819567,4807311,30022515,215155907,
 1673895429]