A028351 - OEIS

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A028351 as a simple table

n	a(n)
1	1
2	0
3	1
4	1
5	5
6	9
7	33
8	85
9	276
10	827
11	2693
12	8626
13	28639
14	95393
15	323367
16	1104525
17	3813797
18	13266366
19	46509357
20	164098390

[1,0,1,1,5,9,33,85,276,827,2693,8626,28639,95393, 323367,1104525,3813797,13266366,46509357, 164098390]