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A247618 as a simple table

na(n)
01
15
217
345
4105
5229
6481
7989
82009
94053
108145
1116333
1232713
1365477
14131009
15262077
16524217
171048501
182097073
194194221
208388521
2116777125
2233554337
2367108765
24134217625
25268435349
26536870801
271073741709
282147483529
294294967173
308589934465

[1,5,17,45,105,229,481,989,2009,4053,8145,16333,
 32713,65477,131009,262077,524217,1048501,2097073,
 4194221,8388521,16777125,33554337,67108765,
 134217625,268435349,536870801,1073741709,
 2147483529,4294967173,8589934465]