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A203074 as a simple table

na(n)
01
12
23
35
411
517
637
767
8131
9257
10521
111031
122053
134099
148209
1516411
1632771
1765537
18131101
19262147
20524309
211048583
222097169
234194319
248388617
2516777259
2633554467
2767108879
28134217757
29268435459
30536870923
311073741827
322147483659

[1,2,3,5,11,17,37,67,131,257,521,1031,2053,4099,
 8209,16411,32771,65537,131101,262147,524309,
 1048583,2097169,4194319,8388617,16777259,33554467,
 67108879,134217757,268435459,536870923,1073741827,
 2147483659]