A273496 - cp's OEIS frontend

A273496 Triangle read by rows: coefficients in the expansion cos(x)^n = (1/2)^n * Sum_{k=0..n} T(n,k) * cos(k*x).

n	a(n)
0	1
1	0
2	2
3	2
4	0
5	2
6	0
7	6
8	0
9	2
10	6
11	0
12	8
13	0
14	2
15	0
16	20
17	0
18	10
19	0
20	2
21	20
22	0
23	30
24	0
25	12
26	0
27	2
28	0
29	70
30	0
31	42
32	0
33	14
34	0
35	2
36	70
37	0
38	112
39	0
40	56
41	0
42	16
43	0
44	2
45	0
46	252
47	0
48	168
49	0
50	72
51	0
52	18
53	0
54	2
55	252
56	0
57	420
58	0
59	240
60	0
61	90
62	0
63	20
64	0
65	2

[1, 0, 2, 2, 0, 2, 0, 6, 0, 2, 6, 0, 8, 0, 2, 0, 20, 0, 10, 0, 2, 20, 0, 30, 0, 12, 0, 2, 0, 70, 0, 42, 0, 14, 0, 2, 70, 0, 112, 0, 56, 0, 16, 0, 2, 0, 252, 0, 168, 0, 72, 0, 18, 0, 2, 252, 0, 420, 0, 240, 0, 90, 0, 20, 0, 2]

cp's OEIS Frontend

A273496 Triangle read by rows: coefficients in the expansion cos(x)^n = (1/2)^n * Sum_{k=0..n} T(n,k) * cos(k*x).

Table of values

List of values

n	a(n)
0	1
1	0
2	2
3	2
4	0
5	2
6	0
7	6
8	0
9	2
10	6
11	0
12	8
13	0
14	2
15	0
16	20
17	0
18	10
19	0
20	2
21	20
22	0
23	30
24	0
25	12
26	0
27	2
28	0
29	70
30	0
31	42
32	0
33	14
34	0
35	2
36	70
37	0
38	112
39	0
40	56
41	0
42	16
43	0
44	2
45	0
46	252
47	0
48	168
49	0
50	72
51	0
52	18
53	0
54	2
55	252
56	0
57	420
58	0
59	240
60	0
61	90
62	0
63	20
64	0
65	2

n	a(n)
0	1
1	0
2	2
3	2
4	0
5	2
6	0
7	6
8	0
9	2
10	6
11	0
12	8
13	0
14	2
15	0
16	20
17	0
18	10
19	0
20	2
21	20
22	0
23	30
24	0
25	12
26	0
27	2
28	0
29	70
30	0
31	42
32	0
33	14
34	0
35	2
36	70
37	0
38	112
39	0
40	56
41	0
42	16
43	0
44	2
45	0
46	252
47	0
48	168
49	0
50	72
51	0
52	18
53	0
54	2
55	252
56	0
57	420
58	0
59	240
60	0
61	90
62	0
63	20
64	0
65	2

n	a(n)
0	1
1	0
2	2
3	2
4	0
5	2
6	0
7	6
8	0
9	2
10	6
11	0
12	8
13	0
14	2
15	0
16	20
17	0
18	10
19	0
20	2
21	20
22	0
23	30
24	0
25	12
26	0
27	2
28	0
29	70
30	0
31	42
32	0
33	14
34	0
35	2
36	70
37	0
38	112
39	0
40	56
41	0
42	16
43	0
44	2
45	0
46	252
47	0
48	168
49	0
50	72
51	0
52	18
53	0
54	2
55	252
56	0
57	420
58	0
59	240
60	0
61	90
62	0
63	20
64	0
65	2