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A045477 as a simple table

n a(n)
0 840
1 2040
2 4440
3 9240
4 25320
5 51000
6 117480
7 271320
8 765480
9 1531320
10 3721800
11 7817640
12 15635640
13 32899560
14 65799480
15 139098120
16 349027320
17 699333000
18 1597611000
19 3386944680
20 9543610200
21 20041583280 

[840,2040,4440,9240,25320,51000,117480,271320,
 765480,1531320,3721800,7817640,15635640,32899560,
 65799480,139098120,349027320,699333000,1597611000,
 3386944680,9543610200,20041583280]

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Last modified June 3 03:48 EDT 2024. Contains 373054 sequences. (Running on oeis4.)