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A084247 as a simple table

n a(n)
0 1
1 2
2 0
3 4
4 -4
5 12
6 -20
7 44
8 -84
9 172
10 -340
11 684
12 -1364
13 2732
14 -5460
15 10924
16 -21844
17 43692
18 -87380
19 174764
20 -349524
21 699052
22 -1398100
23 2796204
24 -5592404
25 11184812
26 -22369620
27 44739244
28 -89478484
29 178956972
30 -357913940
31 715827884
32 -1431655764
33 2863311532

[1,2,0,4,-4,12,-20,44,-84,172,-340,684,-1364,2732,
 -5460,10924,-21844,43692,-87380,174764,-349524,
 699052,-1398100,2796204,-5592404,11184812,
 -22369620,44739244,-89478484,178956972,-357913940,
 715827884,-1431655764,2863311532]

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Last modified April 23 15:11 EDT 2024. Contains 371914 sequences. (Running on oeis4.)