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A068539 as a simple table

n a(n)
0 1
1 5
2 25
3 120
4 580
5 2800
6 13500
7 65100
8 313940
9 1513820
10 7299760
11 35200020
12 169736780
13 818482260
14 3946776920
15 19031623000 

[1,5,25,120,580,2800,13500,65100,313940,1513820,
 7299760,35200020,169736780,818482260,3946776920,
 19031623000]

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)