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A147250 as a simple table

na(n)
11
21
31
41
51
63
77
815
931
10125
11537
122497
1311379
1473403
15564557
165044749
1748150503
18565823439
197944991263
20131881718303
212468412664385

[1,1,1,1,1,3,7,15,31,125,537,2497,11379,73403,
 564557,5044749,48150503,565823439,7944991263,
 131881718303,2468412664385]