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A113956 as a simple table

n a(n)
0 1
1 3
2 12
3 48
4 194
5 787
6 3199
7 13017
8 52997
9 215831
10 879076
11 3580511
12 14582842
13 59388280
14 241829963
15 984609111
16 4008282780
17 16315179752
18 66399357417
19 270193396769
20 1099323033137
21 4472155924094
22 18190769442979
23 73982564102230

[1,3,12,48,194,787,3199,13017,52997,215831,879076,
 3580511,14582842,59388280,241829963,984609111,
 4008282780,16315179752,66399357417,270193396769,
 1099323033137,4472155924094,18190769442979,
 73982564102230]

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Last modified August 22 08:23 EDT 2019. Contains 326172 sequences. (Running on oeis4.)