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A120009 as a simple table

n a(n)
1 1
2 1
3 1
4 0
5 -6
6 -33
7 -143
8 -572
9 -2210
10 -8398
11 -31654
12 -118864
13 -445740
14 -1671525
15 -6273135
16 -23571780
17 -88704330
18 -334347090
19 -1262330850
20 -4773905760
21 -18083762580
22 -68611922730
23 -260725306374
24 -992233959480
25 -3781513867796
26 -14431491699548
27 -55147299002348

[1,1,1,0,-6,-33,-143,-572,-2210,-8398,-31654,
 -118864,-445740,-1671525,-6273135,-23571780,
 -88704330,-334347090,-1262330850,-4773905760,
 -18083762580,-68611922730,-260725306374,
 -992233959480,-3781513867796,-14431491699548,
 -55147299002348]

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Last modified August 8 23:02 EDT 2020. Contains 336300 sequences. (Running on oeis4.)