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A268010 as a simple table

n a(n)
1 1
2 2
3 4
4 12
5 40
6 154
7 656
8 3074
9 15616
10 85360
11 498464
12 3092450
13 20286360
14 140153382
15 1016262080
16 7710988372
17 61062381784
18 503482376930
19 4313580705728
20 38328590370762
21 352618807559008
22 3353663977088848
23 32927374589861296

[1,2,4,12,40,154,656,3074,15616,85360,498464,
 3092450,20286360,140153382,1016262080,7710988372,
 61062381784,503482376930,4313580705728,
 38328590370762,352618807559008,3353663977088848,
 32927374589861296]

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Last modified December 3 05:02 EST 2023. Contains 367531 sequences. (Running on oeis4.)