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A056664
as a simple table
n
a(n)
1
2
2
18
3
78
4
138
5
222
6
462
7
543
8
1095
9
1418
10
3246
11
3876
12
4416
13
9506
14
11090
15
14601
16
27810
17
29187
[2,18,78,138,222,462,543,1095,1418,3246,3876,4416, 9506,11090,14601,27810,29187]