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A118456 as a simple table

n a(n)
1 2
2 4
3 12
4 60
5 300
6 2100
7 14700
8 161700
9 1778700
10 19565700
11 215222700
12 2797895100
13 36372636300
14 618334817100
15 10511691890700
16 178698762141900
17 3037878956412300
18 57719700171833700
19 1096674303264840300
20 25223508975091326900
21 580140706427100518700
22 13343236247823311930100

[2,4,12,60,300,2100,14700,161700,1778700,19565700,
 215222700,2797895100,36372636300,618334817100,
 10511691890700,178698762141900,3037878956412300,
 57719700171833700,1096674303264840300,
 25223508975091326900,580140706427100518700,
 13343236247823311930100]

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Last modified September 12 23:29 EDT 2024. Contains 375855 sequences. (Running on oeis4.)