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A180439
as a simple table
n
a(n)
0
1
1
3
2
3
3
3
4
9
5
15
6
33
7
63
8
153
9
219
10
261
11
351
12
585
13
879
14
933
15
1233
16
1401
17
1899
18
2301
19
3111
[1,3,3,3,9,15,33,63,153,219,261,351,585,879,933, 1233,1401,1899,2301,3111]