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A081546 as a simple table

na(n)
02
15
217
397
4257
53457
612289
740961
865537
9786433
105308417
1114155777
12104857601
13167772161
141811939329
153221225473
1624159191041
1777309411329
18206158430209
192061584302081
202748779069441
216597069766657
2239582418599937

[2,5,17,97,257,3457,12289,40961,65537,786433,
 5308417,14155777,104857601,167772161,1811939329,
 3221225473,24159191041,77309411329,206158430209,
 2061584302081,2748779069441,6597069766657,
 39582418599937]