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A065866 as a simple table

n a(n)
0 1
1 2
2 10
3 84
4 1008
5 15840
6 308880
7 7207200
8 196035840
9 6094932480
10 213322636800
11 8303173401600
12 355850288640000
13 16653793508352000
14 845180020548864000
15 46236318771202560000
16 2712530701243883520000
17 169890080762116915200000
18 11314679378756986552320000

[1,2,10,84,1008,15840,308880,7207200,196035840,
 6094932480,213322636800,8303173401600,
 355850288640000,16653793508352000,
 845180020548864000,46236318771202560000,
 2712530701243883520000,169890080762116915200000,
 11314679378756986552320000]

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Last modified May 23 05:03 EDT 2019. Contains 323508 sequences. (Running on oeis4.)