A108416 - cp's OEIS frontend

A108416 Triangle read by rows: T(n,k) counts the k-subsets of the n-th roots of 1 with absolute value of sum=1.

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	3
7	0
8	4
9	0
10	0
11	5
12	0
13	0
14	6
15	6
16	12
17	0
18	7
19	0
20	0
21	0
22	8
23	0
24	24
25	0
26	0
27	9
28	9
29	0
30	18
31	0
32	10
33	0
34	40
35	10
36	60
37	0
38	11
39	0
40	0
41	0
42	0
43	0
44	12
45	12
46	60
47	72
48	144
49	120
50	0
51	13
52	0
53	0
54	0
55	0
56	0
57	0
58	14
59	0
60	84
61	0
62	210
63	14
64	280
65	0
66	15
67	15
68	0
69	75
70	60
71	30
72	105
73	0
74	16
75	0
76	112
77	0
78	336
79	0
80	560
81	0
82	0
83	17
84	0
85	0

[0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 0, 5, 0, 0, 6, 6, 12, 0, 7, 0, 0, 0, 8, 0, 24, 0, 0, 9, 9, 0, 18, 0, 10, 0, 40, 10, 60, 0, 11, 0, 0, 0, 0, 0, 12, 12, 60, 72, 144, 120, 0, 13, 0, 0, 0, 0, 0, 0, 14, 0, 84, 0, 210, 14, 280, 0, 15, 15, 0, 75, 60, 30, 105, 0, 16, 0, 112, 0, 336, 0, 560, 0, 0, 17, 0, 0]

cp's OEIS Frontend

A108416 Triangle read by rows: T(n,k) counts the k-subsets of the n-th roots of 1 with absolute value of sum=1.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	3
7	0
8	4
9	0
10	0
11	5
12	0
13	0
14	6
15	6
16	12
17	0
18	7
19	0
20	0
21	0
22	8
23	0
24	24
25	0
26	0
27	9
28	9
29	0
30	18
31	0
32	10
33	0
34	40
35	10
36	60
37	0
38	11
39	0
40	0
41	0
42	0
43	0
44	12
45	12
46	60
47	72
48	144
49	120
50	0
51	13
52	0
53	0
54	0
55	0
56	0
57	0
58	14
59	0
60	84
61	0
62	210
63	14
64	280
65	0
66	15
67	15
68	0
69	75
70	60
71	30
72	105
73	0
74	16
75	0
76	112
77	0
78	336
79	0
80	560
81	0
82	0
83	17
84	0
85	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	3
7	0
8	4
9	0
10	0
11	5
12	0
13	0
14	6
15	6
16	12
17	0
18	7
19	0
20	0
21	0
22	8
23	0
24	24
25	0
26	0
27	9
28	9
29	0
30	18
31	0
32	10
33	0
34	40
35	10
36	60
37	0
38	11
39	0
40	0
41	0
42	0
43	0
44	12
45	12
46	60
47	72
48	144
49	120
50	0
51	13
52	0
53	0
54	0
55	0
56	0
57	0
58	14
59	0
60	84
61	0
62	210
63	14
64	280
65	0
66	15
67	15
68	0
69	75
70	60
71	30
72	105
73	0
74	16
75	0
76	112
77	0
78	336
79	0
80	560
81	0
82	0
83	17
84	0
85	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	3
7	0
8	4
9	0
10	0
11	5
12	0
13	0
14	6
15	6
16	12
17	0
18	7
19	0
20	0
21	0
22	8
23	0
24	24
25	0
26	0
27	9
28	9
29	0
30	18
31	0
32	10
33	0
34	40
35	10
36	60
37	0
38	11
39	0
40	0
41	0
42	0
43	0
44	12
45	12
46	60
47	72
48	144
49	120
50	0
51	13
52	0
53	0
54	0
55	0
56	0
57	0
58	14
59	0
60	84
61	0
62	210
63	14
64	280
65	0
66	15
67	15
68	0
69	75
70	60
71	30
72	105
73	0
74	16
75	0
76	112
77	0
78	336
79	0
80	560
81	0
82	0
83	17
84	0
85	0