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A012180 as a simple table

n a(n)
0 1
1 2
2 16
3 48
4 -29696
5 -6049792
6 -1262426112
7 -308569372672
8 -89297625350144
9 -30123113337716736
10 -11520007513318621184
11 -4775431672418431664128
12 -1952929261585732032528384
13 -545214673336986589066166272

[1,2,16,48,-29696,-6049792,-1262426112,
 -308569372672,-89297625350144,-30123113337716736,
 -11520007513318621184,-4775431672418431664128,
 -1952929261585732032528384,
 -545214673336986589066166272]

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Last modified June 3 22:46 EDT 2023. Contains 363116 sequences. (Running on oeis4.)