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A250554 as a simple table

na(n)
12
28
314
432
562
6128
7254
8512
91022
102048
114094
128192
1316382
1432768
1565534
16131072
17262142
18524288
191048574
202097152
214194302
228388608
2316777214
2433554432
2567108862
26134217728
27268435454
28536870912
291073741822
302147483648
314294967294

[2,8,14,32,62,128,254,512,1022,2048,4094,8192,
 16382,32768,65534,131072,262142,524288,1048574,
 2097152,4194302,8388608,16777214,33554432,
 67108862,134217728,268435454,536870912,1073741822,
 2147483648,4294967294]