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A009172 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 12
5 -60
6 90
7 -420
8 12320
9 -124992
10 753480
11 -6481200
12 110644776
13 -1613081184
14 18917874976
15 -250425171360
16 4359533351680
17 -78311204695424
18 1329852024578496
19 -23869209971687040
20 483284209880289152

[1,0,0,0,12,-60,90,-420,12320,-124992,753480,
 -6481200,110644776,-1613081184,18917874976,
 -250425171360,4359533351680,-78311204695424,
 1329852024578496,-23869209971687040,
 483284209880289152]

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Last modified June 18 11:09 EDT 2024. Contains 373481 sequences. (Running on oeis4.)