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A172252 as a simple table

na(n)
1-1
27
323
455
5119
6247
7503
81015
92039
104087
118183
1216375
1332759
1465527
15131063
16262135
17524279
181048567
192097143
204194295
218388599
2216777207
2333554423
2467108855
25134217719
26268435447
27536870903
281073741815
292147483639

[-1,7,23,55,119,247,503,1015,2039,4087,8183,16375,
 32759,65527,131063,262135,524279,1048567,2097143,
 4194295,8388599,16777207,33554423,67108855,
 134217719,268435447,536870903,1073741815,
 2147483639]