A074493 - OEIS

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A074493 as a simple table

n	a(n)
1	1
2	5
3	25
4	49
5	125
6	251
7	499
8	751
9	1249
10	4999
11	18229
12	31249
13	49999
14	281249
15	4218751
16	4999999
17	9590417
18	31622777
19	68171507
20	74218751
21	574218751
22	5740883989
23	8829261293

[1,5,25,49,125,251,499,751,1249,4999,18229,31249, 49999,281249,4218751,4999999,9590417,31622777, 68171507,74218751,574218751,5740883989,8829261293]