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A254570 as a simple table

n a(n)
1 0
2 3
3 57
4 1284
5 34220
6 1098720
7 41579328
8 1832244288
9 92830006368
10 5353120671120
11 348383876993900
12 25409389391925264
13 2064511110000765192
14 185885772163424273304
15 18458953746901624026000
16 2012589235930543617012480
17 239897773975844015012351360
18 31132547318002718989156350240
19 4380969784826872849927354999092
20 665896601825393760478978112600400 

[0,3,57,1284,34220,1098720,41579328,1832244288,
 92830006368,5353120671120,348383876993900,
 25409389391925264,2064511110000765192,
 185885772163424273304,18458953746901624026000,
 2012589235930543617012480,
 239897773975844015012351360,
 31132547318002718989156350240,
 4380969784826872849927354999092,
 665896601825393760478978112600400]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)