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A277215 as a simple table

na(n)
00
126
26
314
430
51214
61662
7254
8510
91022
102046
1128670
1240958
13180222
1432766
1565534
16131070
171835006
185767166
191048574
202097150
214194302
228388606
2316777214
2433554430
25469762046
26671088638
27268435454
28536870910
297516192766
302147483646
314294967294
328589934590
3317179869182
3434359738366
35755914244094

[0,26,6,14,30,1214,1662,254,510,1022,2046,28670,
 40958,180222,32766,65534,131070,1835006,5767166,
 1048574,2097150,4194302,8388606,16777214,33554430,
 469762046,671088638,268435454,536870910,
 7516192766,2147483646,4294967294,8589934590,
 17179869182,34359738366,755914244094]