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A022902 formatted as a simple table:

n a(n)
1 0
2 1
3 0
4 0
5 0
6 2
7 0
8 1
9 0
10 9
11 0
12 24
13 0
14 55
15 0
16 139
17 0
18 593
19 0
20 1816
21 0

[0,1,0,0,0,2,0,1,0,9,0,24,0,55,0,139,0,593,0,1816,
 0]

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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