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A075266 as a simple table

na(n)
11
25
31
4251
519
619087
7751
81070017
92857
1026842253
11434293
12703604254357
138181904909
141166309819657
155044289
168092989203533249
175026792806787
1812600467236042756559
1969028763155644023
208136836498467582599787

[1,5,1,251,19,19087,751,1070017,2857,26842253,
 434293,703604254357,8181904909,1166309819657,
 5044289,8092989203533249,5026792806787,
 12600467236042756559,69028763155644023,
 8136836498467582599787]