A016103 - OEIS

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A016103 as a simple table

n	a(n)
0	1
1	15
2	151
3	1275
4	9751
5	70035
6	481951
7	3216795
8	20991751
9	134667555
10	852639151
11	5343198315
12	33212784151
13	205111785075
14	1260114546751
15	7708980203835
16	46999640806951
17	285743822630595
18	1733261544204751

[1,15,151,1275,9751,70035,481951,3216795,20991751, 134667555,852639151,5343198315,33212784151, 205111785075,1260114546751,7708980203835, 46999640806951,285743822630595,1733261544204751]