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A104565 as a simple table

n a(n)
0 1
1 -2
2 3
3 -2
4 -6
5 28
6 -61
7 54
8 158
9 -860
10 2062
11 -2004
12 -5804
13 33720
14 -84509
15 86054
16 247862
17 -1492908
18 3838298
19 -4019452
20 -11537556
21 71101832
22 -185868978
23 198310460
24 567902572
25 -3555617432
26 9404104764
27 -10168382696
28 -29069700056
29 184127171952
30 -491229517661

[1,-2,3,-2,-6,28,-61,54,158,-860,2062,-2004,-5804,
 33720,-84509,86054,247862,-1492908,3838298,
 -4019452,-11537556,71101832,-185868978,198310460,
 567902572,-3555617432,9404104764,-10168382696,
 -29069700056,184127171952,-491229517661]

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)