A085691 - cp's OEIS frontend

A085691 Triangle read by rows: T(n,k) is the number of triangles of side k in triangular matchstick arrangement of side n; n>=1 and k>=1.

n	a(n)
1	1
2	4
3	1
4	9
5	3
6	1
7	16
8	7
9	3
10	1
11	25
12	13
13	6
14	3
15	1
16	36
17	21
18	11
19	6
20	3
21	1
22	49
23	31
24	18
25	10
26	6
27	3
28	1
29	64
30	43
31	27
32	16
33	10
34	6
35	3
36	1
37	81
38	57
39	38
40	24
41	15
42	10
43	6
44	3
45	1
46	100
47	73
48	51
49	34
50	22
51	15
52	10
53	6
54	3
55	1
56	121
57	91
58	66
59	46
60	31
61	21
62	15
63	10
64	6
65	3
66	1
67	144
68	111
69	83
70	60
71	42
72	29
73	21
74	15
75	10
76	6
77	3
78	1

[1, 4, 1, 9, 3, 1, 16, 7, 3, 1, 25, 13, 6, 3, 1, 36, 21, 11, 6, 3, 1, 49, 31, 18, 10, 6, 3, 1, 64, 43, 27, 16, 10, 6, 3, 1, 81, 57, 38, 24, 15, 10, 6, 3, 1, 100, 73, 51, 34, 22, 15, 10, 6, 3, 1, 121, 91, 66, 46, 31, 21, 15, 10, 6, 3, 1, 144, 111, 83, 60, 42, 29, 21, 15, 10, 6, 3, 1]

cp's OEIS Frontend

A085691 Triangle read by rows: T(n,k) is the number of triangles of side k in triangular matchstick arrangement of side n; n>=1 and k>=1.

Table of values

List of values

n	a(n)
1	1
2	4
3	1
4	9
5	3
6	1
7	16
8	7
9	3
10	1
11	25
12	13
13	6
14	3
15	1
16	36
17	21
18	11
19	6
20	3
21	1
22	49
23	31
24	18
25	10
26	6
27	3
28	1
29	64
30	43
31	27
32	16
33	10
34	6
35	3
36	1
37	81
38	57
39	38
40	24
41	15
42	10
43	6
44	3
45	1
46	100
47	73
48	51
49	34
50	22
51	15
52	10
53	6
54	3
55	1
56	121
57	91
58	66
59	46
60	31
61	21
62	15
63	10
64	6
65	3
66	1
67	144
68	111
69	83
70	60
71	42
72	29
73	21
74	15
75	10
76	6
77	3
78	1

n	a(n)
1	1
2	4
3	1
4	9
5	3
6	1
7	16
8	7
9	3
10	1
11	25
12	13
13	6
14	3
15	1
16	36
17	21
18	11
19	6
20	3
21	1
22	49
23	31
24	18
25	10
26	6
27	3
28	1
29	64
30	43
31	27
32	16
33	10
34	6
35	3
36	1
37	81
38	57
39	38
40	24
41	15
42	10
43	6
44	3
45	1
46	100
47	73
48	51
49	34
50	22
51	15
52	10
53	6
54	3
55	1
56	121
57	91
58	66
59	46
60	31
61	21
62	15
63	10
64	6
65	3
66	1
67	144
68	111
69	83
70	60
71	42
72	29
73	21
74	15
75	10
76	6
77	3
78	1

n	a(n)
1	1
2	4
3	1
4	9
5	3
6	1
7	16
8	7
9	3
10	1
11	25
12	13
13	6
14	3
15	1
16	36
17	21
18	11
19	6
20	3
21	1
22	49
23	31
24	18
25	10
26	6
27	3
28	1
29	64
30	43
31	27
32	16
33	10
34	6
35	3
36	1
37	81
38	57
39	38
40	24
41	15
42	10
43	6
44	3
45	1
46	100
47	73
48	51
49	34
50	22
51	15
52	10
53	6
54	3
55	1
56	121
57	91
58	66
59	46
60	31
61	21
62	15
63	10
64	6
65	3
66	1
67	144
68	111
69	83
70	60
71	42
72	29
73	21
74	15
75	10
76	6
77	3
78	1