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A146448 as a simple table

na(n)
11
21
31
41
53
67
715
849
9233
101205
117091
1256369
13554977
146653663
1598474615
161800719003
1740485995917
181128941883627
1939031781085873
201652786153476941

[1,1,1,1,3,7,15,49,233,1205,7091,56369,554977,
 6653663,98474615,1800719003,40485995917,
 1128941883627,39031781085873,1652786153476941]