A181634 - cp's OEIS frontend

A181634 Irregular triangle T(n,k) where row n contains all pairs [a,b] of the compositions n=a+b into nonnegative pairs where a == b (mod 3).

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

[1, 1, 3, 0, 0, 3, 2, 2, 4, 1, 1, 4, 6, 0, 3, 3, 0, 6, 5, 2, 2, 5, 7, 1, 4, 4, 1, 7, 9, 0, 6, 3, 3, 6, 0, 9, 8, 2, 5, 5, 2, 8, 10, 1, 7, 4, 4, 7, 1, 10, 12, 0, 9, 3, 6, 6, 3, 9, 0, 12, 11, 2, 8, 5, 5, 8, 2, 11, 13, 1, 10, 4, 7, 7, 4, 10, 1, 13, 15, 0, 12, 3, 9, 6, 6]

cp's OEIS Frontend

A181634 Irregular triangle T(n,k) where row n contains all pairs [a,b] of the compositions n=a+b into nonnegative pairs where a == b (mod 3).

Table of values

List of values

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

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

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