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A009156 as a simple table

n a(n)
0 1
1 0
2 1
3 -3
4 20
5 -140
6 1216
7 -12096
8 137080
9 -1737504
10 24368656
11 -374527120
12 6259083896
13 -112992788688
14 2191121957480
15 -45420491782680
16 1002232901602496
17 -23453004823018496
18 580102806342112960

[1,0,1,-3,20,-140,1216,-12096,137080,-1737504,
 24368656,-374527120,6259083896,-112992788688,
 2191121957480,-45420491782680,1002232901602496,
 -23453004823018496,580102806342112960]

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Last modified May 26 18:08 EDT 2020. Contains 334630 sequences. (Running on oeis4.)