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A198786 as a simple table

n a(n)
0 1
1 2
2 4
3 4
4 0
5 -4
6 0
7 8
8 0
9 -20
10 0
11 56
12 0
13 -168
14 0
15 528
16 0
17 -1716
18 0
19 5720
20 0
21 -19448
22 0
23 67184
24 0
25 -235144
26 0
27 832048
28 0
29 -2971600
30 0
31 10697760
32 0
33 -38779380
34 0
35 141430680
36 0
37 -518579160
38 0
39 1910554800
40 0
41 -7069052760
42 0
43 26256481680
44 0
45 -97865068080
46 0
47 365930254560
48 0

[1,2,4,4,0,-4,0,8,0,-20,0,56,0,-168,0,528,0,-1716,
 0,5720,0,-19448,0,67184,0,-235144,0,832048,0,
 -2971600,0,10697760,0,-38779380,0,141430680,0,
 -518579160,0,1910554800,0,-7069052760,0,
 26256481680,0,-97865068080,0,365930254560,0]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)