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A054599 as a simple table

n a(n)
0 0
1 1
2 4
3 7
4 16
5 21
6 52
7 71
8 160
9 277
10 564
11 1035
12 2176
13 4109
14 8348
15 16467
16 33088
17 65553
18 131740
19 262163
20 525456
21 1048817
22 2099244
23 4194327
24 8393344
25 16777321
26 33562676
27 67109695
28 134234480
29 268435485
30 536905572
31 1073741855
32 2147549824

[0,1,4,7,16,21,52,71,160,277,564,1035,2176,4109,
 8348,16467,33088,65553,131740,262163,525456,
 1048817,2099244,4194327,8393344,16777321,33562676,
 67109695,134234480,268435485,536905572,1073741855,
 2147549824]

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Last modified August 7 17:44 EDT 2020. Contains 336278 sequences. (Running on oeis4.)