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A019104 as a simple table

n a(n)
3 0
4 1
5 4
6 2
7 6
8 24
9 26
10 88
11 244
12 438
13 1296
14 3420
15 7602
16 20290
17 53200
18 131606
19 343613
20 897170 

[0,1,4,2,6,24,26,88,244,438,1296,3420,7602,20290,
 53200,131606,343613,897170]

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Last modified May 25 00:42 EDT 2013. Contains 225631 sequences.