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A104297 as a simple table

na(n)
121
231
353
4103
5239
6659
72213
88887
942473
10240151
111584607
1212069311
13105036509
141034651039
1511438277847
16142253144233
171946420671121
1829165259660989

[21,31,53,103,239,659,2213,8887,42473,240151,
 1584607,12069311,105036509,1034651039,11438277847,
 142253144233,1946420671121,29165259660989]