A273166 - OEIS

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A273166 as a simple table

n	a(n)
0	1
1	2
2	0
3	-2
4	2
5	4
6	-4
7	-6
8	6
9	10
10	-8
11	-16
12	14
13	24
14	-24
15	-36
16	36
17	56
18	-52
19	-82
20	78
21	116
22	-116
23	-168
24	166
25	242
26	-232
27	-338
28	328
29	468
30	-464
31	-648
32	640
33	892
34	-872
35	-1214
36	1192
37	1636
38	-1620
39	-2198
40	2176

[1,2,0,-2,2,4,-4,-6,6,10,-8,-16,14,24,-24,-36,36, 56,-52,-82,78,116,-116,-168,166,242,-232,-338,328, 468,-464,-648,640,892,-872,-1214,1192,1636,-1620, -2198,2176]