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A009567 as a simple table

n a(n)
0 0
1 1
2 -1
3 2
4 -8
5 31
6 -136
7 692
8 -3968
9 25261
10 -176896
11 1351382
12 -11184128
13 99680491
14 -951878656
15 9695756072
16 -104932671488
17 1202439837721
18 -14544442556416
19 185185594118762
20 -2475749026562048
21 34674437196568951

[0,1,-1,2,-8,31,-136,692,-3968,25261,-176896,
 1351382,-11184128,99680491,-951878656,9695756072,
 -104932671488,1202439837721,-14544442556416,
 185185594118762,-2475749026562048,
 34674437196568951]

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Last modified October 21 01:47 EDT 2018. Contains 316405 sequences. (Running on oeis4.)