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A026520 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 8
5 20
6 38
7 104
8 196
9 556
10 1052
11 3032
12 5774
13 16778
14 32146
15 93872
16 180772
17 529684
18 1024256
19 3008864
20 5837908
21 17184188
22 33433996
23 98577712
24 192239854
25 567591142
26 1109049320
27 3278348608
28 6416509142
29 18986482250

[1,1,2,4,8,20,38,104,196,556,1052,3032,5774,16778,
 32146,93872,180772,529684,1024256,3008864,5837908,
 17184188,33433996,98577712,192239854,567591142,
 1109049320,3278348608,6416509142,18986482250]

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Last modified April 23 02:41 EDT 2024. Contains 371906 sequences. (Running on oeis4.)