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A329394
as a simple table
n
a(n)
1
1
2
2
3
2
4
4
5
4
6
10
7
13
8
28
9
46
10
99
11
175
12
359
13
672
14
1358
15
2627
16
5238
17
10262
18
20438
19
40320
20
80137
[1,2,2,4,4,10,13,28,46,99,175,359,672,1358,2627, 5238,10262,20438,40320,80137]