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A124839 as a simple table

n a(n)
0 1
1 -2
2 2
3 -1
4 -2
5 10
6 -30
7 76
8 -173
9 363
10 -717
11 1363
12 -2551
13 4797
14 -9189
15 18015
16 -36008
17 72725
18 -146930
19 294423
20 -581758
21 1130231
22 -2158552
23 4061201
24 -7557522
25 13983585
26 -25872679
27 48115364
28 -90273986
29 171186911

[1,-2,2,-1,-2,10,-30,76,-173,363,-717,1363,-2551,
 4797,-9189,18015,-36008,72725,-146930,294423,
 -581758,1130231,-2158552,4061201,-7557522,
 13983585,-25872679,48115364,-90273986,171186911]

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Last modified May 24 17:09 EDT 2019. Contains 323533 sequences. (Running on oeis4.)