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A083686 as a simple table

na(n)
08
115
229
357
4113
5225
6449
7897
81793
93585
107169
1114337
1228673
1357345
14114689
15229377
16458753
17917505
181835009
193670017
207340033
2114680065
2229360129
2358720257
24117440513
25234881025
26469762049
27939524097
281879048193
293758096385
307516192769
3115032385537

[8,15,29,57,113,225,449,897,1793,3585,7169,14337,
 28673,57345,114689,229377,458753,917505,1835009,
 3670017,7340033,14680065,29360129,58720257,
 117440513,234881025,469762049,939524097,
 1879048193,3758096385,7516192769,15032385537]