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A109116 as a simple table

n a(n)
0 20
1 432
2 3024
3 12800
4 40500
5 105840
6 241472
7 497664
8 947700
9 1694000
10 2874960
11 4672512
12 7320404
13 11113200
14 16416000
15 23674880
16 33428052
17 46317744
18 63102800
19 84672000
20 112058100
21 146452592
22 189221184
23 241920000
24 306312500
25 384387120

[20,432,3024,12800,40500,105840,241472,497664,
 947700,1694000,2874960,4672512,7320404,11113200,
 16416000,23674880,33428052,46317744,63102800,
 84672000,112058100,146452592,189221184,241920000,
 306312500,384387120]

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Last modified July 12 18:03 EDT 2020. Contains 335666 sequences. (Running on oeis4.)