A332442 - cp's OEIS frontend

A332442 Triangle read by rows, T(n,k) is the number of regular triangles of length k (in some length unit), for k from {1, 2, ... , n}, in a matchstick arrangement with enclosing triangle of length n, but only triangles with orientation opposite to the enclosing triangle are counted.

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

[0, 1, 0, 3, 0, 0, 6, 1, 0, 0, 10, 3, 0, 0, 0, 15, 6, 1, 0, 0, 0, 21, 10, 3, 0, 0, 0, 0, 28, 15, 6, 1, 0, 0, 0, 0, 36, 21, 10, 3, 0, 0, 0, 0, 0, 45, 28, 15, 6, 1, 0, 0, 0, 0, 0, 55, 36, 21, 10, 3, 0, 0, 0, 0, 0, 0, 66, 45, 28, 15, 6, 1, 0, 0, 0, 0, 0, 0, 78, 55, 36, 21, 10, 3, 0, 0, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A332442 Triangle read by rows, T(n,k) is the number of regular triangles of length k (in some length unit), for k from {1, 2, ... , n}, in a matchstick arrangement with enclosing triangle of length n, but only triangles with orientation opposite to the enclosing triangle are counted.

Table of values

List of values

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

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

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