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A194590 as a simple table

n a(n)
0 0
1 0
2 1
3 -2
4 7
5 -14
6 38
7 -76
8 187
9 -374
10 874
11 -1748
12 3958
13 -7916
14 17548
15 -35096
16 76627
17 -153254
18 330818
19 -661636
20 1415650
21 -2831300
22 6015316
23 -12030632
24 25413342
25 -50826684
26 106853668
27 -213707336
28 447472972
29 -894945944
30 1867450648
31 -3734901296
32 7770342787

[0,0,1,-2,7,-14,38,-76,187,-374,874,-1748,3958,
 -7916,17548,-35096,76627,-153254,330818,-661636,
 1415650,-2831300,6015316,-12030632,25413342,
 -50826684,106853668,-213707336,447472972,
 -894945944,1867450648,-3734901296,7770342787]

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Last modified March 23 14:17 EDT 2019. Contains 321431 sequences. (Running on oeis4.)