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A022899 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 0
6 0
7 0
8 4
9 0
10 9
11 0
12 14
13 0
14 75
15 0
16 155
17 0
18 724
19 0
20 2376
21 0
22 6900

[0,0,0,1,0,0,0,4,0,9,0,14,0,75,0,155,0,724,0,2376,
 0,6900]

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Last modified October 24 09:28 EDT 2014. Contains 248516 sequences.