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A012126 as a simple table

n a(n)
0 1
1 -3
2 49
3 -1971
4 147457
5 -17712131
6 3119521521
7 -757475512691
8 242537719364737
9 -99014166389423235
10 50196880291533920305
11 -30939568726951088808371
12 22784988607303653453394305

[1,-3,49,-1971,147457,-17712131,3119521521,
 -757475512691,242537719364737,-99014166389423235,
 50196880291533920305,-30939568726951088808371,
 22784988607303653453394305]

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Last modified November 29 13:17 EST 2021. Contains 349416 sequences. (Running on oeis4.)