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A273647 as a simple table

n a(n)
0 1
1 4
2 28
3 160
4 636
5 2828
6 11620
7 47388
8 189744
9 762824
10 3056616
11 12220008
12 48892908
13 195589736
14 782409540
15 3129838452 

[1,4,28,160,636,2828,11620,47388,189744,762824,
 3056616,12220008,48892908,195589736,782409540,
 3129838452]

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Last modified April 23 09:48 EDT 2024. Contains 371905 sequences. (Running on oeis4.)