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A005054 as a simple table

n a(n)
0 1
1 4
2 20
3 100
4 500
5 2500
6 12500
7 62500
8 312500
9 1562500
10 7812500
11 39062500
12 195312500
13 976562500
14 4882812500
15 24414062500
16 122070312500
17 610351562500
18 3051757812500
19 15258789062500
20 76293945312500
21 381469726562500
22 1907348632812500
23 9536743164062500

[1,4,20,100,500,2500,12500,62500,312500,1562500,
 7812500,39062500,195312500,976562500,4882812500,
 24414062500,122070312500,610351562500,
 3051757812500,15258789062500,76293945312500,
 381469726562500,1907348632812500,9536743164062500]

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)