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A168405 as a simple table

n a(n)
0 1
1 2
2 16
3 520
4 66560
5 33882400
6 69055283200
7 564153087455360
8 18462510039810703360
9 2418626471936038215754240
10 1267795676362601991645220044800
11 2658560574070850656450883768752998400

[1,2,16,520,66560,33882400,69055283200,
 564153087455360,18462510039810703360,
 2418626471936038215754240,
 1267795676362601991645220044800,
 2658560574070850656450883768752998400]

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Last modified January 26 20:11 EST 2020. Contains 331288 sequences. (Running on oeis4.)