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A166587 as a simple table

n a(n)
0 1
1 1
2 -1
3 2
4 -4
5 9
6 -21
7 51
8 -127
9 323
10 -835
11 2188
12 -5798
13 15511
14 -41835
15 113634
16 -310572
17 853467
18 -2356779
19 6536382
20 -18199284
21 50852019
22 -142547559
23 400763223
24 -1129760415
25 3192727797
26 -9043402501
27 25669818476
28 -73007772802

[1,1,-1,2,-4,9,-21,51,-127,323,-835,2188,-5798,
 15511,-41835,113634,-310572,853467,-2356779,
 6536382,-18199284,50852019,-142547559,400763223,
 -1129760415,3192727797,-9043402501,25669818476,
 -73007772802]

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Last modified February 18 05:48 EST 2018. Contains 299298 sequences. (Running on oeis4.)