A127805 - OEIS

A127805 as a simple table

n	a(n)
0	1
1	0
2	11
3	0
4	-11
5	111
6	0
7	11
8	-111
9	1111
10	0
11	0
12	0
13	-1111
14	11111
15	0
16	-11
17	111
18	0
19	-11111
20	111111
21	0
22	0
23	0
24	0
25	0
26	-111111
27	1111111
28	0
29	11
30	-111
31	1111
32	0
33	0
34	-1111111
35	11111111
36	0
37	0
38	0
39	0
40	0
41	0
42	0
43	-11111111
44	111111111

[1,0,11,0,-11,111,0,11,-111,1111,0,0,0,-1111, 11111,0,-11,111,0,-11111,111111,0,0,0,0,0,-111111, 1111111,0,11,-111,1111,0,0,-1111111,11111111,0,0, 0,0,0,0,0,-11111111,111111111]