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A232879 as a simple table

n a(n)
1 1
2 -1
3 -5
4 -13
5 -37
6 -83
7 -194
8 -469
9 -1111
10 -2743
11 -6698
12 -16379
13 -40543
14 -101251
15 -254053
16 -640483
17 -1622840
18 -4133371
19 -10578367
20 -27130829
21 -69814219

[1,-1,-5,-13,-37,-83,-194,-469,-1111,-2743,-6698,
 -16379,-40543,-101251,-254053,-640483,-1622840,
 -4133371,-10578367,-27130829,-69814219]

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)