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A275994 as a simple table

n a(n)
1 1
2 -1
3 1
4 -17
5 31
6 -691
7 5461
8 -929569
9 3202291
10 -221930581
11 4722116521
12 -968383680827
13 14717667114151
14 -2093660879252671
15 86125672563201181
16 -129848163681107301953
17 868320396104950823611
18 -209390615747646519456961
19 14129659550745551130667441
20 -8486725345098385062639014237

[1,-1,1,-17,31,-691,5461,-929569,3202291,
 -221930581,4722116521,-968383680827,
 14717667114151,-2093660879252671,
 86125672563201181,-129848163681107301953,
 868320396104950823611,-209390615747646519456961,
 14129659550745551130667441,
 -8486725345098385062639014237]

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Last modified October 20 10:45 EDT 2019. Contains 328257 sequences. (Running on oeis4.)