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A145634 as a simple table

n a(n)
1 2
2 12
3 20
4 280
5 2520
6 27720
7 27720
8 11088
9 62832
10 5969040
11 1989680
12 137287920
13 686439600
14 882565200
15 25594390800
16 1586852229600
17 1586852229600
18 11107965607200
19 410994727466400
20 410994727466400
21 16850783826122400

[2,12,20,280,2520,27720,27720,11088,62832,5969040,
 1989680,137287920,686439600,882565200,25594390800,
 1586852229600,1586852229600,11107965607200,
 410994727466400,410994727466400,16850783826122400]

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Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)