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A131935 as a simple table

na(n)
14
27
315
431
565
6136
7285
8597
91251
102621
115492
1211507
1324111
1450519
15105853

[4,7,15,31,65,136,285,597,1251,2621,5492,11507,
 24111,50519,105853]