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A126984 as a simple table

n a(n)
0 1
1 -2
2 2
3 -4
4 2
5 -12
6 -12
7 -72
8 -190
9 -700
10 -2308
11 -8120
12 -28364
13 -100856
14 -360792
15 -1301904
16 -4727358
17 -17268636
18 -63405012
19 -233885784
20 -866327748
21 -3220976616
22 -12016209192
23 -44966763504
24 -168750724428
25 -634935132312
26 -2394717424552
27 -9051945482032

[1,-2,2,-4,2,-12,-12,-72,-190,-700,-2308,-8120,
 -28364,-100856,-360792,-1301904,-4727358,
 -17268636,-63405012,-233885784,-866327748,
 -3220976616,-12016209192,-44966763504,
 -168750724428,-634935132312,-2394717424552,
 -9051945482032]

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Last modified April 19 02:12 EDT 2024. Contains 371782 sequences. (Running on oeis4.)