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A188803 as a simple table

na(n)
13
217
3257
4641
565537
6167772161
72748779069441
846179488366593
91328165573307087716353
10188894659314785808547841

[3,17,257,641,65537,167772161,2748779069441,
 46179488366593,1328165573307087716353,
 188894659314785808547841]