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A107248 as a simple table

na(n)
01
11
21
337
437
5169
6169
7553
8553
92461
102461
1111857
1211857
1351409
1451409
15219733
16219733
17969721
18969721
194285177
204285177
2118755149
2218755149
2382122913
2482122913
25360600481
26360600481
271582788997
281582788997
296941826889

[1,1,1,37,37,169,169,553,553,2461,2461,11857,
 11857,51409,51409,219733,219733,969721,969721,
 4285177,4285177,18755149,18755149,82122913,
 82122913,360600481,360600481,1582788997,
 1582788997,6941826889]