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A057266 as a simple table

na(n)
11
27
349
4343
5539
6959
71309
82401
97889
1016807
1118851
1278449
13117649
14142991
15590773
16814247
17823543

[1,7,49,343,539,959,1309,2401,7889,16807,18851,
 78449,117649,142991,590773,814247,823543]