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A009093 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 -12
5 60
6 -90
7 420
8 -8960
9 64512
10 -299880
11 3709200
12 -52709976
13 480109344
14 -4993564576
15 83895608160
16 -1246488056320
17 15764924418944
18 -251656080793536
19 4849396180905600
20 -84861914800295552
21 1455466222530055680

[1,0,0,0,-12,60,-90,420,-8960,64512,-299880,
 3709200,-52709976,480109344,-4993564576,
 83895608160,-1246488056320,15764924418944,
 -251656080793536,4849396180905600,
 -84861914800295552,1455466222530055680]

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Last modified May 29 13:50 EDT 2024. Contains 372949 sequences. (Running on oeis4.)