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A057833 as a simple table

na(n)
11
27
349
4343
5539
62401
72429
84169
916807
1036197
1181977
12117649
13160867
14314531
15823543
161226911
171294139
184751579
195764801

[1,7,49,343,539,2401,2429,4169,16807,36197,81977,
 117649,160867,314531,823543,1226911,1294139,
 4751579,5764801]