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A012268 as a simple table

n a(n)
0 0
1 0
2 2
3 6
4 22
5 100
6 788
7 8568
8 103416
9 1307808
10 17722512
11 264361680
12 4373968080

[0,0,2,6,22,100,788,8568,103416,1307808,17722512,
 264361680,4373968080]

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Last modified October 25 17:08 EDT 2014. Contains 248557 sequences.