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A053524 formatted as a simple table:

n a(n)
0 0
1 1
2 4
3 28
4 160
5 976
6 5824
7 35008
8 209920
9 1259776
10 7558144
11 45349888
12 272097280
13 1632587776
14 9795518464
15 58773127168
16 352638730240
17 2115832446976
18 12694994550784
19 76169967566848
20 457019804876800
21 2742118830309376
22 16452712979759104

[0,1,4,28,160,976,5824,35008,209920,1259776,
 7558144,45349888,272097280,1632587776,9795518464,
 58773127168,352638730240,2115832446976,
 12694994550784,76169967566848,457019804876800,
 2742118830309376,16452712979759104]

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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