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A280920 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 720
7 4320
8 30960
9 256320
10 2399760
11 25022880
12 287250480
13 3597143040
14 48773612880
15 711607724640
16 11113078385520
17 184925331414720
18 3265974496290960
19 61006644910213920
20 1201583921745846960
21 24885771463659934080
22 540624959563046320080
23 12291921453805577987040

[0,0,0,0,0,720,4320,30960,256320,2399760,25022880,
 287250480,3597143040,48773612880,711607724640,
 11113078385520,184925331414720,3265974496290960,
 61006644910213920,1201583921745846960,
 24885771463659934080,540624959563046320080,
 12291921453805577987040]

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Last modified April 27 11:10 EDT 2024. Contains 372019 sequences. (Running on oeis4.)