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A253649 as a simple table

n a(n)
0 1
1 1
2 0
3 -10
4 -80
5 0
6 17600
7 418000
8 0
9 -496672000
10 -23576960000
11 0
12 91442700800000
13 7255463564800000
14 0
15 -69994087116448000000
16 -8354181454767104000000
17 0
18 169165728883243642880000000
19 28336045031124313753600000000
20 0
21 -1072156342430107319243161600000000

[1,1,0,-10,-80,0,17600,418000,0,-496672000,
 -23576960000,0,91442700800000,7255463564800000,0,
 -69994087116448000000,-8354181454767104000000,0,
 169165728883243642880000000,
 28336045031124313753600000000,0,
 -1072156342430107319243161600000000]

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Last modified October 15 09:22 EDT 2019. Contains 328026 sequences. (Running on oeis4.)