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A108509 as a simple table

n a(n)
1 1
2 5
3 20
4 100
5 480
6 1980
7 7680
8 29040
9 100920
10 316320
11 923520
12 2502000
13 6011760
14 12584880
15 23417280
16 38196480
17 50112000
18 53667840
19 64988160
20 64988160 

[1,5,20,100,480,1980,7680,29040,100920,316320,
 923520,2502000,6011760,12584880,23417280,38196480,
 50112000,53667840,64988160,64988160]

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Last modified July 3 05:06 EDT 2024. Contains 373966 sequences. (Running on oeis4.)