A258206 - OEIS

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A258206 as a simple table

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	1
7	3
8	2
9	12
10	14
11	50
12	97
13	312
14	744
15	2291
16	6186
17	18714
18	53793
19	162565
20	482416
21	1467094
22	4436536
23	13594266

[0,0,1,0,1,1,3,2,12,14,50,97,312,744,2291,6186, 18714,53793,162565,482416,1467094,4436536, 13594266]