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A235884 as a simple table

na(n)
121
251
351
4129
5105
6129
7339
8231
9231
10339
11921
12537
13453
14537
15921
162571
171311
18951
19951
201311
212571
227329
233345
242109
251833
262109
273345
287329
2921219
308871
314911
323759
333759
344911
358871
3621219
3762121
3824297
3911973
408097
417221
428097
4311973
4424297
4562121

[21,51,51,129,105,129,339,231,231,339,921,537,453,
 537,921,2571,1311,951,951,1311,2571,7329,3345,
 2109,1833,2109,3345,7329,21219,8871,4911,3759,
 3759,4911,8871,21219,62121,24297,11973,8097,7221,
 8097,11973,24297,62121]