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A007188 as a simple table

n a(n)
0 2
1 6
2 90
3 47250
4 66852843750
5 2806877704512541816406250
6 1216935896582703898519354781702537118597533386230468750

[2,6,90,47250,66852843750,
 2806877704512541816406250,
 12169358965827038985193547817025371185975333862304\
 68750]

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Last modified August 20 10:17 EDT 2019. Contains 326149 sequences. (Running on oeis4.)