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A003163 as a simple table

n a(n)
0 1
1 2
2 5
3 20
4 350
5 140
6 1050
7 300
8 57750
9 38500
10 250250
11 45500
12 2388750
13 367500
14 318750
15 42500
16 1088106250
17 128012500
18 960093750
19 101062500
20 105761906250
21 10072562500
22 2289218750
23 199062500
24 8842968750
25 707437500
26 51289218750

[1,2,5,20,350,140,1050,300,57750,38500,250250,
 45500,2388750,367500,318750,42500,1088106250,
 128012500,960093750,101062500,105761906250,
 10072562500,2289218750,199062500,8842968750,
 707437500,51289218750]

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Last modified August 25 00:27 EDT 2016. Contains 275784 sequences.