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A209290 as a simple table

n a(n)
0 0
1 0
2 2
3 24
4 324
5 5120
6 93750
7 1959552
8 46118408
9 1207959552
10 34867844010
11 1100000000000
12 37661140520652
13 1390911669927936
14 55123269399790046
15 2333521433367183360
16 105094533691406250000
17 5017514388048998039552
18 253135520137219049838162
19 13456471561751415850795008

[0,0,2,24,324,5120,93750,1959552,46118408,
 1207959552,34867844010,1100000000000,
 37661140520652,1390911669927936,55123269399790046,
 2333521433367183360,105094533691406250000,
 5017514388048998039552,253135520137219049838162,
 13456471561751415850795008]

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Last modified March 28 16:00 EDT 2024. Contains 371254 sequences. (Running on oeis4.)