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A165553 as a simple table

n a(n)
0 1
1 3
2 -3
3 15
4 -39
5 123
6 -363
7 1095
8 -3279
9 9843
10 -29523
11 88575
12 -265719
13 797163
14 -2391483
15 7174455
16 -21523359
17 64570083
18 -193710243
19 581130735
20 -1743392199
21 5230176603
22 -15690529803
23 47071589415
24 -141214768239

[1,3,-3,15,-39,123,-363,1095,-3279,9843,-29523,
 88575,-265719,797163,-2391483,7174455,-21523359,
 64570083,-193710243,581130735,-1743392199,
 5230176603,-15690529803,47071589415,-141214768239]

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Last modified October 21 05:28 EDT 2021. Contains 348141 sequences. (Running on oeis4.)