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A048806 as a simple table

n a(n)
0 1
1 -1
2 1
3 -1
4 0
5 4
6 -24
7 104
8 -88
9 42
10 536
11 -7536
12 32230
13 -207052
14 791194
15 3748874
16 -15956672
17 224309712
18 -757708060
19 5189018388

[1,-1,1,-1,0,4,-24,104,-88,42,536,-7536,32230,
 -207052,791194,3748874,-15956672,224309712,
 -757708060,5189018388]

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Last modified January 19 09:35 EST 2020. Contains 331048 sequences. (Running on oeis4.)