A032176 - OEIS

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A032176 as a simple table

n	a(n)
1	1
2	1
3	3
4	6
5	15
6	34
7	82
8	193
9	464
10	1111
11	2683
12	6482
13	15730
14	38232
15	93177
16	227458
17	556323
18	1362639
19	3342504
20	8209130
21	20185204
22	49684404
23	122413446
24	301870406
25	745019874
26	1840103575
27	4548008306
28	11248190948

[1,1,3,6,15,34,82,193,464,1111,2683,6482,15730, 38232,93177,227458,556323,1362639,3342504,8209130, 20185204,49684404,122413446,301870406,745019874, 1840103575,4548008306,11248190948]