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A159367 as a simple table

n a(n)
2 4
3 540
4 18720
5 531300
6 8583300
7 86748088
8 623757696
9 3483871560
10 16023245700
11 63174296020
12 219752181792
13 688950636972
14 1978607887620
15 5271705817200
16 13162584962560
17 31050835145616
18 69671782148868
19 149524133455500

[4,540,18720,531300,8583300,86748088,623757696,
 3483871560,16023245700,63174296020,219752181792,
 688950636972,1978607887620,5271705817200,
 13162584962560,31050835145616,69671782148868,
 149524133455500]

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Last modified June 25 03:59 EDT 2022. Contains 354835 sequences. (Running on oeis4.)