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A293566 as a simple table

n a(n)
0 1
1 -1
2 1
3 -1
4 1
5 -121
6 721
7 -2521
8 6721
9 -378001
10 5473441
11 -39972241
12 199679041
13 -7005552841
14 176899522801
15 -2186722497961
16 17454339826561
17 -459473703430561
18 16503993702423361
19 -306140370496394401
20 3555223271216311681
21 -80917223353652470681

[1,-1,1,-1,1,-121,721,-2521,6721,-378001,5473441,
 -39972241,199679041,-7005552841,176899522801,
 -2186722497961,17454339826561,-459473703430561,
 16503993702423361,-306140370496394401,
 3555223271216311681,-80917223353652470681]

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Last modified September 18 07:50 EDT 2019. Contains 327168 sequences. (Running on oeis4.)