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A012701 as a simple table

n a(n)
0 0
1 0
2 2
3 -3
4 16
5 -50
6 128
7 756
8 -20064
9 298656
10 -3561408
11 38990160
12 -310756800
13 467943840
14 66887172480
15 -2183463747360
16 51505489029120
17 -1001091175633920
18 15963926463621120
19 -153477175865587200

[0,0,2,-3,16,-50,128,756,-20064,298656,-3561408,
 38990160,-310756800,467943840,66887172480,
 -2183463747360,51505489029120,-1001091175633920,
 15963926463621120,-153477175865587200]

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Last modified December 8 22:51 EST 2016. Contains 278957 sequences.