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A131562 as a simple table

n a(n)
0 1
1 -2
2 2
3 -2
4 4
5 -10
6 22
7 -44
8 86
9 -170
10 340
11 -682
12 1366
13 -2732
14 5462
15 -10922
16 21844
17 -43690
18 87382
19 -174764
20 349526
21 -699050
22 1398100
23 -2796202
24 5592406
25 -11184812
26 22369622
27 -44739242
28 89478484
29 -178956970
30 357913942
31 -715827884
32 1431655766
33 -2863311530

[1,-2,2,-2,4,-10,22,-44,86,-170,340,-682,1366,
 -2732,5462,-10922,21844,-43690,87382,-174764,
 349526,-699050,1398100,-2796202,5592406,-11184812,
 22369622,-44739242,89478484,-178956970,357913942,
 -715827884,1431655766,-2863311530]

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Last modified August 14 01:33 EDT 2020. Contains 336473 sequences. (Running on oeis4.)