A084117 - cp's OEIS frontend

A084117 Multiplicity of the factor (1+x+x^2) in the characteristic polynomial modulo 2 of the symmetric matrix with entries binomial(i+j,i), 0<=i,j

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

[0, 0, 1, 0, 1, 0, 3, 2, 3, 2, 5, 0, 3, 2, 5, 4, 5, 4, 7, 2, 5, 0, 11, 6, 9, 8, 11, 6, 9, 8, 11, 10, 11, 10, 13, 8, 11, 6, 17, 12, 15, 10, 21, 0, 11, 6, 17, 12, 15, 14, 17, 12, 15, 10, 21, 16, 19, 18, 21, 16, 19, 18, 21, 20, 21, 20, 23, 18, 21, 16, 27, 22, 25, 20, 31, 10, 21, 16, 27, 22, 25]

cp's OEIS Frontend

A084117 Multiplicity of the factor (1+x+x^2) in the characteristic polynomial modulo 2 of the symmetric matrix with entries binomial(i+j,i), 0<=i,j

Table of values

List of values

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

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

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