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A355575 as a simple table

n a(n)
0 1
1 0
2 0
3 6
4 24
5 120
6 1080
7 10080
8 120960
9 1874880
10 34473600
11 738460800
12 17982518400
13 489858969600
14 14834839219200
15 498452777222400
16 18583796335104000
17 768773914900992000
18 35220800475250790400
19 1779227869201400217600
20 98469904378626772992000

[1,0,0,6,24,120,1080,10080,120960,1874880,
 34473600,738460800,17982518400,489858969600,
 14834839219200,498452777222400,18583796335104000,
 768773914900992000,35220800475250790400,
 1779227869201400217600,98469904378626772992000]

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Last modified August 22 10:30 EDT 2024. Contains 375369 sequences. (Running on oeis4.)