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A147173 as a simple table

na(n)
11
21
31
41
51
63
711
827
957
10269
111741
1211383
1371261
14614161
157140843
1699666239
171560593149
1829491532325
19702793762267
2020557975075647

[1,1,1,1,1,3,11,27,57,269,1741,11383,71261,614161,
 7140843,99666239,1560593149,29491532325,
 702793762267,20557975075647]