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A331552 as a simple table

n a(n)
0 1
1 2
2 -6
3 -12
4 30
5 60
6 -140
7 -280
8 630
9 1260
10 -2772
11 -5544
12 12012
13 24024
14 -51480
15 -102960
16 218790
17 437580
18 -923780
19 -1847560
20 3879876
21 7759752
22 -16224936
23 -32449872
24 67603900
25 135207800
26 -280816200
27 -561632400
28 1163381400
29 2326762800
30 -4808643120
31 -9617286240
32 19835652870

[1,2,-6,-12,30,60,-140,-280,630,1260,-2772,-5544,
 12012,24024,-51480,-102960,218790,437580,-923780,
 -1847560,3879876,7759752,-16224936,-32449872,
 67603900,135207800,-280816200,-561632400,
 1163381400,2326762800,-4808643120,-9617286240,
 19835652870]

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Last modified April 19 15:11 EDT 2024. Contains 371794 sequences. (Running on oeis4.)