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A160657 as a simple table

na(n)
12
26
314
414
562
6126
730
830
91022
10126
114094
122046
131022
1432766
1562
1662
178190
18174762
198190
202046
21254
228190
2316777214
244194302
25510
26134217726
272097150
281022
291073741822
302147483646
31126
32126
3317179869182
348388606
3568719476734
361022
372097150
382147483646

[2,6,14,14,62,126,30,30,1022,126,4094,2046,1022,
 32766,62,62,8190,174762,8190,2046,254,8190,
 16777214,4194302,510,134217726,2097150,1022,
 1073741822,2147483646,126,126,17179869182,8388606,
 68719476734,1022,2097150,2147483646]