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A009655 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
13 -79413478560
14 1558387903200
15 -32713320769920
16 731007454396800
17 -17347090012492800
18 436154519763744000
19 -11585396062022112000

[0,0,2,-6,22,-100,788,-8568,103416,-1307808,
 17722512,-264361680,4373968080,-79413478560,
 1558387903200,-32713320769920,731007454396800,
 -17347090012492800,436154519763744000,
 -11585396062022112000]

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Last modified April 23 13:11 EDT 2024. Contains 371913 sequences. (Running on oeis4.)