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A221955 as a simple table

n a(n)
1 1
2 12
3 432
4 25920
5 2177280
6 235146240
7 31039303680
8 4842131374080
9 871583647334400
10 177803064056217600
11 40539098604817612800
12 10215852848414038425600
13 2819575386162274605465600
14 845872615848682381639680000
15 274062727534973091651256320000
16 95373829182170635894637199360000
17 35479064455767476552805038161920000 

[1,12,432,25920,2177280,235146240,31039303680,
 4842131374080,871583647334400,177803064056217600,
 40539098604817612800,10215852848414038425600,
 2819575386162274605465600,
 845872615848682381639680000,
 274062727534973091651256320000,
 95373829182170635894637199360000,
 35479064455767476552805038161920000]

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Last modified May 18 19:36 EDT 2024. Contains 372666 sequences. (Running on oeis4.)