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A206372 as a simple table

n a(n)
0 13
1 55
2 223
3 895
4 3583
5 14335
6 57343
7 229375
8 917503
9 3670015
10 14680063
11 58720255
12 234881023
13 939524095
14 3758096383
15 15032385535
16 60129542143
17 240518168575
18 962072674303
19 3848290697215
20 15393162788863
21 61572651155455
22 246290604621823
23 985162418487295

[13,55,223,895,3583,14335,57343,229375,917503,
 3670015,14680063,58720255,234881023,939524095,
 3758096383,15032385535,60129542143,240518168575,
 962072674303,3848290697215,15393162788863,
 61572651155455,246290604621823,985162418487295]

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Last modified October 22 12:22 EDT 2018. Contains 316446 sequences. (Running on oeis4.)