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A196971 as a simple table

na(n)
15
257
3386
43675
531899
6260394
72246059
819246379
9164006734
101400773245
1111965906663
12102191052974
13872793094884
147454220149765
1563663510400324
16543728417138307
174643793942698920
1839660975017361508
19338730301259452052

[5,57,386,3675,31899,260394,2246059,19246379,
 164006734,1400773245,11965906663,102191052974,
 872793094884,7454220149765,63663510400324,
 543728417138307,4643793942698920,
 39660975017361508,338730301259452052]