A260591 - OEIS

A260591 as a simple table

n	a(n)
1	0
2	1
3	0
4	1
5	2
6	0
7	3
8	7
9	0
10	12
11	0
12	30
13	85
14	0
15	173
16	476
17	0
18	961
19	0
20	2652
21	8045
22	0
23	17637
24	51033
25	0
26	108950
27	312455
28	0
29	663535
30	0
31	1900470
32	5936673
33	0
34	13472296
35	39993895
36	0
37	87986917
38	0
39	257978502
40	820236724
41	0
42	1899474678
43	5723030586
44	0
45	12809477536
46	38036848410
47	0
48	84141805077
49	0
50	248369601964

[0,1,0,1,2,0,3,7,0,12,0,30,85,0,173,476,0,961,0, 2652,8045,0,17637,51033,0,108950,312455,0,663535, 0,1900470,5936673,0,13472296,39993895,0,87986917, 0,257978502,820236724,0,1899474678,5723030586,0, 12809477536,38036848410,0,84141805077,0, 248369601964]

[0,1,0,1,2,0,3,7,0,12,0,30,85,0,173,476,0,961,0,
 2652,8045,0,17637,51033,0,108950,312455,0,663535,
 0,1900470,5936673,0,13472296,39993895,0,87986917,
 0,257978502,820236724,0,1899474678,5723030586,0,
 12809477536,38036848410,0,84141805077,0,
 248369601964]