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A035891 as a simple table

n a(n)
0 1
1 0
2 1800
3 0
4 541200
5 0
6 65520920
7 0
8 4296107040
9 0
10 177923724072
11 0
12 5119703270960
13 0
14 109262828065080
15 536870912
16 1814093339150400
17 249644974080
18 24305082449321800
19 21968757719040
20 270526359458466384

[1,0,1800,0,541200,0,65520920,0,4296107040,0,
 177923724072,0,5119703270960,0,109262828065080,
 536870912,1814093339150400,249644974080,
 24305082449321800,21968757719040,
 270526359458466384]

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Last modified May 20 12:16 EDT 2022. Contains 353871 sequences. (Running on oeis4.)