A049344 - OEIS

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A049344 as a simple table

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	8
7	14
8	39
9	96
10	297
11	915
12	3308
13	12417
14	51347
15	222595
16	1016975
17	4799520
18	23301779
19	115405815
20	581071711
21	2963793396
22	15283327150
23	79544488072
24	417377448058

[0,1,1,2,3,8,14,39,96,297,915,3308,12417,51347, 222595,1016975,4799520,23301779,115405815, 581071711,2963793396,15283327150,79544488072, 417377448058]