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A056309 as a simple table

n a(n)
1 0
2 1
3 4
4 8
5 18
6 34
7 70
8 134
9 270
10 526
11 1054
12 2078
13 4158
14 8254
15 16510
16 32894
17 65790
18 131326
19 262654
20 524798
21 1049598
22 2098174
23 4196350
24 8390654
25 16781310
26 33558526
27 67117054
28 134225918
29 268451838
30 536887294
31 1073774590
32 2147516414
33 4295032830
34 8590000126

[0,1,4,8,18,34,70,134,270,526,1054,2078,4158,8254,
 16510,32894,65790,131326,262654,524798,1049598,
 2098174,4196350,8390654,16781310,33558526,
 67117054,134225918,268451838,536887294,1073774590,
 2147516414,4295032830,8590000126]

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Last modified August 30 09:28 EDT 2024. Contains 375532 sequences. (Running on oeis4.)