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A153588 as a simple table

n a(n)
1 1
2 3
3 7
4 15
5 35
6 77
7 179
8 429
9 1039
10 2525
11 6235
12 15463
13 38513
14 96231
15 241519
16 607339
17 1529533
18 3857447
19 9743247
20 24634043
21 62335495
22 157885967
23 400211085
24 1015080877
25 2576308943

[1,3,7,15,35,77,179,429,1039,2525,6235,15463,
 38513,96231,241519,607339,1529533,3857447,9743247,
 24634043,62335495,157885967,400211085,1015080877,
 2576308943]

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Last modified April 3 20:26 EDT 2020. Contains 333199 sequences. (Running on oeis4.)