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A191219 as a simple table

na(n)
15
29
313
441
549
661
7113
8121
9169
10181
11225
12289
13313
14421
15441
16613
17625
18761
19925
201013
211201
221301
231521
241681
251741
261849
271861
282025
292113
302381
312401
322521
333121
343481
353613
363969
374325
384513
394761
404901

[5,9,13,41,49,61,113,121,169,181,225,289,313,421,
 441,613,625,761,925,1013,1201,1301,1521,1681,1741,
 1849,1861,2025,2113,2381,2401,2521,3121,3481,3613,
 3969,4325,4513,4761,4901]