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A176926 as a simple table

na(n)
137
241
397
42081
54129
616417
732801
81048609
91073741857
101152921504606847009
11295147905179352825889
1237778931862957161709601
13324518553658426726783156020576289
1483076749736557242056487941267521569

[37,41,97,2081,4129,16417,32801,1048609,
 1073741857,1152921504606847009,
 295147905179352825889,37778931862957161709601,
 324518553658426726783156020576289,
 83076749736557242056487941267521569]