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A186903
as a simple table
n
a(n)
0
1
1
2
2
5
3
14
4
36
5
112
6
354
7
1193
8
4099
9
14374
10
51265
11
185143
12
675016
13
2481768
14
9183221
15
34179072
16
127826852
[1,2,5,14,36,112,354,1193,4099,14374,51265,185143, 675016,2481768,9183221,34179072,127826852]