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A146728 as a simple table

na(n)
11
21
31
41
51
63
713
831
959
10133
11487
121853
138419
1438423
15183353
161033531
176717069
1850468649
19417543651
203765006993
2138269269195
22435116516817

[1,1,1,1,1,3,13,31,59,133,487,1853,8419,38423,
 183353,1033531,6717069,50468649,417543651,
 3765006993,38269269195,435116516817]