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A166421 as a simple table

n a(n)
0 1
1 27
2 702
3 18252
4 474552
5 12338352
6 320797152
7 8340725952
8 216858874752
9 5638330743552
10 146596599332352
11 3811511582640801
12 99099301148651700
13 2576581829864707275
14 66991127576476229100
15 1741769316988221795300

[1,27,702,18252,474552,12338352,320797152,
 8340725952,216858874752,5638330743552,
 146596599332352,3811511582640801,
 99099301148651700,2576581829864707275,
 66991127576476229100,1741769316988221795300]

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)