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A052840 as a simple table

n a(n)
0 0
1 0
2 2
3 9
4 56
5 450
6 4464
7 52920
8 731520
9 11566800
10 206035200
11 4083488640
12 89137843200
13 2124970848000
14 54929029478400
15 1530259226496000
16 45705137084006400
17 1456873475016960000
18 49362677881380864000

[0,0,2,9,56,450,4464,52920,731520,11566800,
 206035200,4083488640,89137843200,2124970848000,
 54929029478400,1530259226496000,45705137084006400,
 1456873475016960000,49362677881380864000]

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)