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A239234
as a simple table
n
a(n)
0
0
1
2
2
6
3
17
4
36
5
99
6
249
7
651
8
1774
9
5018
10
13587
11
39170
12
115968
13
323061
14
953827
15
2870277
16
8165537
17
24569821
[0,2,6,17,36,99,249,651,1774,5018,13587,39170, 115968,323061,953827,2870277,8165537,24569821]