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A319788 as a simple table

n a(n)
1 1
2 4
3 20
4 120
5 560
6 19600
7 27720
8 1521520
9 7207200
10 2845642800
11 4170866700
12 249466897680
13 9117204216120
14 1723262134513920
15 2525472914524560
16 189169152233901840
17 1782424363173854400
18 28708458878287188000
19 15137401000857582807360
20 32632841312905676442600
21 647550654467707884653760

[1,4,20,120,560,19600,27720,1521520,7207200,
 2845642800,4170866700,249466897680,9117204216120,
 1723262134513920,2525472914524560,
 189169152233901840,1782424363173854400,
 28708458878287188000,15137401000857582807360,
 32632841312905676442600,647550654467707884653760]

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Last modified September 5 12:22 EDT 2024. Contains 375696 sequences. (Running on oeis4.)