A204431 - cp's OEIS frontend

A204431 Symmetric matrix: f(i,j)=(2i+j+1 mod 3), by antidiagonals.

n	a(n)
1	2
2	1
3	1
4	0
5	0
6	0
7	2
8	2
9	2
10	2
11	1
12	1
13	1
14	1
15	1
16	0
17	0
18	0
19	0
20	0
21	0
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	1
34	1
35	1
36	1
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	2
47	2
48	2
49	2
50	2
51	2
52	2
53	2
54	2
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	1
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	2
80	2
81	2
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	1

[2, 1, 1, 0, 0, 0, 2, 2, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A204431 Symmetric matrix: f(i,j)=(2i+j+1 mod 3), by antidiagonals.

Table of values

List of values

n	a(n)
1	2
2	1
3	1
4	0
5	0
6	0
7	2
8	2
9	2
10	2
11	1
12	1
13	1
14	1
15	1
16	0
17	0
18	0
19	0
20	0
21	0
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	1
34	1
35	1
36	1
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	2
47	2
48	2
49	2
50	2
51	2
52	2
53	2
54	2
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	1
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	2
80	2
81	2
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	1

n	a(n)
1	2
2	1
3	1
4	0
5	0
6	0
7	2
8	2
9	2
10	2
11	1
12	1
13	1
14	1
15	1
16	0
17	0
18	0
19	0
20	0
21	0
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	1
34	1
35	1
36	1
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	2
47	2
48	2
49	2
50	2
51	2
52	2
53	2
54	2
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	1
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	2
80	2
81	2
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	1

n	a(n)
1	2
2	1
3	1
4	0
5	0
6	0
7	2
8	2
9	2
10	2
11	1
12	1
13	1
14	1
15	1
16	0
17	0
18	0
19	0
20	0
21	0
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	1
34	1
35	1
36	1
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	2
47	2
48	2
49	2
50	2
51	2
52	2
53	2
54	2
55	2
56	1
57	1
58	1
59	1
60	1
61	1
62	1
63	1
64	1
65	1
66	1
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	2
80	2
81	2
82	2
83	2
84	2
85	2
86	2
87	2
88	2
89	2
90	2
91	2
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	1