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A006675 as a simple table

n a(n)
0 0
1 0
2 2
3 15
4 104
5 770
6 6264
7 56196
8 554112
9 5973264
10 69998400
11 886897440
12 12089295360
13 176484597120
14 2748022986240
15 45472329504000
16 796983880089600
17 14751208762214400
18 287543058350284800

[0,0,2,15,104,770,6264,56196,554112,5973264,
 69998400,886897440,12089295360,176484597120,
 2748022986240,45472329504000,796983880089600,
 14751208762214400,287543058350284800]

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Last modified October 22 14:44 EDT 2019. Contains 328318 sequences. (Running on oeis4.)