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A012597 as a simple table

n a(n)
0 2
1 -8
2 -40
3 4352
4 8608
5 -38439040
6 4405714560
7 425680207872
8 -252920252235264
9 -5528067305916416
10 44468403610589394944
11 -15834819953218036760576
12 -5810504218823261839253504

[2,-8,-40,4352,8608,-38439040,4405714560,
 425680207872,-252920252235264,-5528067305916416,
 44468403610589394944,-15834819953218036760576,
 -5810504218823261839253504]

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Last modified September 20 13:36 EDT 2020. Contains 337264 sequences. (Running on oeis4.)