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A174315 as a simple table

na(n)
21
37
497
52221
675721
73591211
8225827617
918168156217
101819029079441
11221716249326991
1232313176619313921
135547478498197397477
141107802527495396486937
15254557467773494382397811

[1,7,97,2221,75721,3591211,225827617,18168156217,
 1819029079441,221716249326991,32313176619313921,
 5547478498197397477,1107802527495396486937,
 254557467773494382397811]