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A009508 as a simple table

n a(n)
0 0
1 2
2 4
3 -18
4 -2200
5 -150150
6 -11618004
7 -1078005082
8 -118928710576
9 -15184771406478
10 -2148536703814700
11 -309605570133329954
12 -34193099991177752904
13 4268254817856544829418
14 6637048590856623019431932

[0,2,4,-18,-2200,-150150,-11618004,-1078005082,
 -118928710576,-15184771406478,-2148536703814700,
 -309605570133329954,-34193099991177752904,
 4268254817856544829418,6637048590856623019431932]

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Last modified December 5 20:39 EST 2021. Contains 349558 sequences. (Running on oeis4.)