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A066274 as a simple table

n a(n)
1 0
2 2
3 18
4 192
5 2500
6 38880
7 705894
8 14680064
9 344373768
10 9000000000
11 259374246010
12 8173092077568
13 279577021469772
14 10318292052303872
15 408700964355468750
16 17293822569102704640
17 778579070010669895696
18 37160496515557841043456
19 1874292305362402347591138

[0,2,18,192,2500,38880,705894,14680064,344373768,
 9000000000,259374246010,8173092077568,
 279577021469772,10318292052303872,
 408700964355468750,17293822569102704640,
 778579070010669895696,37160496515557841043456,
 1874292305362402347591138]

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Last modified February 20 16:25 EST 2018. Contains 299380 sequences. (Running on oeis4.)