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A012676 as a simple table

n a(n)
0 1
1 2
2 -4
3 -40
4 2704
5 -135392
6 6955456
7 -305645184
8 -7730286336
9 7469091807744
10 -2423718751585280
11 765682386623223808
12 -278356000956737810432
13 126892576689335471251456

[1,2,-4,-40,2704,-135392,6955456,-305645184,
 -7730286336,7469091807744,-2423718751585280,
 765682386623223808,-278356000956737810432,
 126892576689335471251456]

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Last modified October 23 16:40 EDT 2020. Contains 337969 sequences. (Running on oeis4.)