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A217596 as a simple table

n a(n)
0 1
1 -1
2 -2
3 -5
4 -17
5 -64
6 -259
7 -1098
8 -4815
9 -21659
10 -99385
11 -463385
12 -2189070
13 -10455340
14 -50402858
15 -244929608
16 -1198504743
17 -5900360016
18 -29204546125
19 -145244328630
20 -725451444795
21 -3637422742470
22 -18301949731665
23 -92380935149100
24 -467659449093330

[1,-1,-2,-5,-17,-64,-259,-1098,-4815,-21659,
 -99385,-463385,-2189070,-10455340,-50402858,
 -244929608,-1198504743,-5900360016,-29204546125,
 -145244328630,-725451444795,-3637422742470,
 -18301949731665,-92380935149100,-467659449093330]

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Last modified July 24 02:42 EDT 2019. Contains 325287 sequences. (Running on oeis4.)