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A068539 as a simple table

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

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

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Last modified September 28 07:55 EDT 2020. Contains 337394 sequences. (Running on oeis4.)