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A009726 as a simple table

n a(n)
0 0
1 1
2 0
3 -1
4 12
5 -54
6 360
7 -2094
8 15568
9 -113516
10 979200
11 -8587668
12 84989520
13 -863430840
14 9562970144
15 -108058865368
16 1285366485120
17 -15130564865136
18 174638241040896
19 -1701739763904144
20 7392841627579840
21 326394843481495456

[0,1,0,-1,12,-54,360,-2094,15568,-113516,979200,
 -8587668,84989520,-863430840,9562970144,
 -108058865368,1285366485120,-15130564865136,
 174638241040896,-1701739763904144,
 7392841627579840,326394843481495456]

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Last modified February 22 09:34 EST 2019. Contains 320389 sequences. (Running on oeis4.)