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A256001
as a simple table
n
a(n)
0
0
1
3
2
6
3
11
4
15
5
23
6
27
7
45
8
81
9
105
10
195
11
329
12
597
13
885
14
1425
15
2793
16
4725
17
8025
18
14265
19
23205
20
41685
[0,3,6,11,15,23,27,45,81,105,195,329,597,885,1425, 2793,4725,8025,14265,23205,41685]