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A264707 as a simple table

n a(n)
1 1
2 1
3 4
4 28
5 176
6 1600
7 16128
8 124416
9 1446336
10 35831808
11 1074954240
12 27136622592
13 711858585600
14 16840949760000
15 456855552000000
16 22466543616000000

[1,1,4,28,176,1600,16128,124416,1446336,35831808,
 1074954240,27136622592,711858585600,
 16840949760000,456855552000000,22466543616000000]

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Last modified September 15 20:11 EDT 2019. Contains 327086 sequences. (Running on oeis4.)