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A082685 as a simple table

n a(n)
0 1
1 4
2 18
3 86
4 422
5 2094
6 10438
7 52126
8 260502
9 1302254
10 6510758
11 32552766
12 162761782
13 813804814
14 4069015878
15 20345063006
16 101725282262
17 508626345774
18 2543131597798
19 12715657726846
20 63578288109942
21 317891439501134

[1,4,18,86,422,2094,10438,52126,260502,1302254,
 6510758,32552766,162761782,813804814,4069015878,
 20345063006,101725282262,508626345774,
 2543131597798,12715657726846,63578288109942,
 317891439501134]

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Last modified March 24 11:49 EDT 2019. Contains 321448 sequences. (Running on oeis4.)