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A012831 as a simple table

n a(n)
0 1
1 1
2 9
3 225
4 6993
5 467745
6 29529753
7 4297350785
8 378759492257
9 122599030798017
10 8002975063348265
11 9354851201922233249
12 -686072407102337430543
13 1787263355638656126843105

[1,1,9,225,6993,467745,29529753,4297350785,
 378759492257,122599030798017,8002975063348265,
 9354851201922233249,-686072407102337430543,
 1787263355638656126843105]

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Last modified September 27 04:03 EDT 2022. Contains 357052 sequences. (Running on oeis4.)