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A321197 as a simple table

n a(n)
0 1
1 0
2 -1
3 1
4 -1
5 3
6 -4
7 10
8 -20
9 42
10 -98
11 210
12 -492
13 1122
14 -2607
15 6149
16 -14443
17 34463
18 -82238
19 197574
20 -476918
21 1154402
22 -2807516
23 6845016
24 -16743674
25 41067512
26 -100967539
27 248843095
28 -614546545
29 1520779665

[1,0,-1,1,-1,3,-4,10,-20,42,-98,210,-492,1122,
 -2607,6149,-14443,34463,-82238,197574,-476918,
 1154402,-2807516,6845016,-16743674,41067512,
 -100967539,248843095,-614546545,1520779665]

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Last modified March 24 00:12 EDT 2019. Contains 321444 sequences. (Running on oeis4.)