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A179493 as a simple table

n a(n)
0 0
1 1
2 2
3 12
4 108
5 1420
6 24660
7 541968
8 14547792
9 465228720
10 17385553440
11 747776581200
12 36566808933600
13 2012537262763872
14 123612631608883872
15 8412289268206662720
16 630378349868153698560
17 51733701375836221013760

[0,1,2,12,108,1420,24660,541968,14547792,
 465228720,17385553440,747776581200,36566808933600,
 2012537262763872,123612631608883872,
 8412289268206662720,630378349868153698560,
 51733701375836221013760]

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Last modified March 23 02:39 EDT 2019. Contains 321422 sequences. (Running on oeis4.)