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A022563
as a simple table
n
a(n)
1
0
2
0
3
1
4
3
5
8
6
32
7
126
8
619
9
3332
10
20910
11
157721
12
1590330
13
23074092
14
487448150
15
14466253437
16
585505737038
[0,0,1,3,8,32,126,619,3332,20910,157721,1590330, 23074092,487448150,14466253437,585505737038]
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Last modified April 25 08:27 EDT 2024. Contains 371964 sequences. (Running on oeis4.)