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A166998 as a simple table

n a(n)
0 1
1 0
2 6
3 28
4 2684
5 85664
6 96848424
7 18318978896
8 459531493100736
9 468613553577122688
10 349607028167776160389536
11 1788682277200384090414421312
12 46561932503015793339090359576558496

[1,0,6,28,2684,85664,96848424,18318978896,
 459531493100736,468613553577122688,
 349607028167776160389536,
 1788682277200384090414421312,
 46561932503015793339090359576558496]

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Last modified August 4 10:56 EDT 2021. Contains 346447 sequences. (Running on oeis4.)