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A237368 as a simple table

n a(n)
1 81
2 288
3 1024
4 3840
5 14400
6 53760
7 200704
8 752640
9 2822400
10 10536960
11 39337984
12 147517440
13 553190400
14 2065244160
15 7710244864
16 28913418240
17 108425318400
18 404787855360
19 1511207993344
20 5667029975040
21 21251362406400
22 79338419650560

[81,288,1024,3840,14400,53760,200704,752640,
 2822400,10536960,39337984,147517440,553190400,
 2065244160,7710244864,28913418240,108425318400,
 404787855360,1511207993344,5667029975040,
 21251362406400,79338419650560]

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Last modified May 24 17:16 EDT 2019. Contains 323533 sequences. (Running on oeis4.)