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A012701 as a simple table

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

[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 21 12:47 EST 2014. Contains 252321 sequences.