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A325871 as a simple table

n a(n)
0 1
1 1
2 4
3 3
4 144
5 40
6 4320
7 1260
8 134400
9 72576
10 21772800
11 6652800
12 100590336000
13 889574400
14 34871316480
15 163459296000
16 627683696640000
17 39520825344000
18 268899695640576000
19 12164510040883200
20 38231317271347200000
21 4644631106519040000
22 6744004366665646080000

[1,1,4,3,144,40,4320,1260,134400,72576,21772800,
 6652800,100590336000,889574400,34871316480,
 163459296000,627683696640000,39520825344000,
 268899695640576000,12164510040883200,
 38231317271347200000,4644631106519040000,
 6744004366665646080000]

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Last modified April 19 04:35 EDT 2024. Contains 371782 sequences. (Running on oeis4.)