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A290575 as a simple table

n a(n)
0 1
1 4
2 40
3 544
4 8536
5 145504
6 2618176
7 48943360
8 941244376
9 18502137184
10 370091343040
11 7508629231360
12 154145664817600
13 3196100636757760
14 66834662101834240
15 1407913577733228544
16 29849617614785770456
17 636440695668355742560
18 13638210075999240396736
19 293565508750164008207104
20 6344596821114216520841536

[1,4,40,544,8536,145504,2618176,48943360,
 941244376,18502137184,370091343040,7508629231360,
 154145664817600,3196100636757760,
 66834662101834240,1407913577733228544,
 29849617614785770456,636440695668355742560,
 13638210075999240396736,293565508750164008207104,
 6344596821114216520841536]

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Last modified April 23 06:58 EDT 2024. Contains 371906 sequences. (Running on oeis4.)