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A271573 as a simple table

na(n)
00
11
21
37
43
521
619
771
817
9265
10261
111035
12515
134109
144103
1516399
162049
1765553
1865545
19262163
20131077
211048597
221048587
234194327
241048579
2516777241
2616777229
2767108891
2833554439
29268435485
30268435471
311073741855
3267108865
334294967329
344294967313

[0,1,1,7,3,21,19,71,17,265,261,1035,515,4109,4103,
 16399,2049,65553,65545,262163,131077,1048597,
 1048587,4194327,1048579,16777241,16777229,
 67108891,33554439,268435485,268435471,1073741855,
 67108865,4294967329,4294967313]