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A111993 as a simple table

n a(n)
0 1
1 5
2 25
3 125
4 630
5 3206
6 16470
7 85350
8 445775
9 2344595
10 12408903
11 66042795
12 353259900
13 1898119100
14 10240583420
15 55454182716
16 301307002605
17 1642192132625
18 8975693643525
19 49186242980105
20 270186765784210

[1,5,25,125,630,3206,16470,85350,445775,2344595,
 12408903,66042795,353259900,1898119100,
 10240583420,55454182716,301307002605,
 1642192132625,8975693643525,49186242980105,
 270186765784210]

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Last modified August 26 12:38 EDT 2024. Contains 375456 sequences. (Running on oeis4.)