A184254 - OEIS

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A184254 as a simple table

n	a(n)
1	1
2	1
3	3
4	5
5	19
6	79
7	333
8	1393
9	5725
10	23408
11	94067
12	372806
13	1452902
14	5573547
15	21048926
16	78294082
17	286989576
18	1037232520
19	3698189056
20	13015198750
21	45236281727
22	155352127515
23	527417864879
24	1770921102747

[1,1,3,5,19,79,333,1393,5725,23408,94067,372806, 1452902,5573547,21048926,78294082,286989576, 1037232520,3698189056,13015198750,45236281727, 155352127515,527417864879,1770921102747]