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A317708
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
4
6
10
7
20
8
48
9
108
10
255
11
595
12
1435
13
3434
14
8372
15
20419
16
50289
17
124289
18
309122
19
771508
20
1934462
[1,1,1,2,4,10,20,48,108,255,595,1435,3434,8372, 20419,50289,124289,309122,771508,1934462]