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A055815 as a simple table

n a(n)
0 1
1 15
2 80
3 432
4 2352
5 12896
6 71136
7 394400
8 2196128
9 12273648
10 68811184
11 386838480
12 2179890000
13 12309739968
14 69641542848
15 394643939904
16 2239678552640
17 12727572969680
18 72415319422992
19 412470467298032

[1,15,80,432,2352,12896,71136,394400,2196128,
 12273648,68811184,386838480,2179890000,
 12309739968,69641542848,394643939904,
 2239678552640,12727572969680,72415319422992,
 412470467298032]

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Last modified April 22 16:25 EDT 2021. Contains 343177 sequences. (Running on oeis4.)