A238827 - OEIS

A238827 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	1
8	2
9	6
10	13
11	33
12	77
13	191
14	464
15	1147
16	2819
17	6956
18	17132
19	42228
20	104026
21	256303
22	631394
23	1555488
24	3831945
25	9440141
26	23256017
27	57292037
28	141140858
29	347705663
30	856585345
31	2110229136
32	5198625560
33	12807001916
34	31550510748
35	77725820617
36	191480359254
37	471718764310
38	1162096170669

[0,0,0,0,0,0,1,2,6,13,33,77,191,464,1147,2819, 6956,17132,42228,104026,256303,631394,1555488, 3831945,9440141,23256017,57292037,141140858, 347705663,856585345,2110229136,5198625560, 12807001916,31550510748,77725820617,191480359254, 471718764310,1162096170669]