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A203971 as a simple table

na(n)
17
2106
32061
434799
5601521
610443081
7180623180
83127443494
954147787428
10937401735877
1116229119258691
12280969835877155
134864330622552017
1484214645085725068
151457981042829787092
1625241554445266482645

[7,106,2061,34799,601521,10443081,180623180,
 3127443494,54147787428,937401735877,
 16229119258691,280969835877155,4864330622552017,
 84214645085725068,1457981042829787092,
 25241554445266482645]