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A002689 as a simple table

n a(n)
0 2
1 6
2 8
3 180
4 32
5 10080
6 3456
7 453600
8 115200
9 47900160
10 71680
11 217945728000
12 36578304000
13 2241727488000
14 45984153600
15 2000741783040000
16 918421504
17 43667471941632000
18 5751865147392000
19 240857298809487360000

[2,6,8,180,32,10080,3456,453600,115200,47900160,
 71680,217945728000,36578304000,2241727488000,
 45984153600,2000741783040000,918421504,
 43667471941632000,5751865147392000,
 240857298809487360000]

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Last modified March 28 21:57 EDT 2024. Contains 371254 sequences. (Running on oeis4.)