A316384 - cp's OEIS frontend

A316384 Number of ways to stack n triangles symmetrically in a valley (pointing upwards or downwards depending on row parity).

n	a(n)
0	1
1	1
2	1
3	0
4	1
5	0
6	1
7	1
8	2
9	1
10	2
11	1
12	2
13	1
14	3
15	1
16	4
17	2
18	5
19	2
20	5
21	2
22	6
23	3
24	8
25	4
26	9
27	4
28	10
29	4
30	12
31	6
32	15
33	7
34	17
35	7
36	19
37	8
38	22
39	10
40	26
41	12
42	30
43	13
44	33
45	14
46	38
47	17
48	45
49	21
50	51
51	22
52	56
53	24
54	64
55	29
56	74
57	33
58	83
59	36
60	92
61	40
62	104
63	46
64	119
65	53
66	133
67	58
68	147
69	63
70	165
71	73
72	187
73	83
74	208
75	90

[1, 1, 1, 0, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 3, 1, 4, 2, 5, 2, 5, 2, 6, 3, 8, 4, 9, 4, 10, 4, 12, 6, 15, 7, 17, 7, 19, 8, 22, 10, 26, 12, 30, 13, 33, 14, 38, 17, 45, 21, 51, 22, 56, 24, 64, 29, 74, 33, 83, 36, 92, 40, 104, 46, 119, 53, 133, 58, 147, 63, 165, 73, 187, 83, 208, 90]

cp's OEIS Frontend

A316384 Number of ways to stack n triangles symmetrically in a valley (pointing upwards or downwards depending on row parity).

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	0
4	1
5	0
6	1
7	1
8	2
9	1
10	2
11	1
12	2
13	1
14	3
15	1
16	4
17	2
18	5
19	2
20	5
21	2
22	6
23	3
24	8
25	4
26	9
27	4
28	10
29	4
30	12
31	6
32	15
33	7
34	17
35	7
36	19
37	8
38	22
39	10
40	26
41	12
42	30
43	13
44	33
45	14
46	38
47	17
48	45
49	21
50	51
51	22
52	56
53	24
54	64
55	29
56	74
57	33
58	83
59	36
60	92
61	40
62	104
63	46
64	119
65	53
66	133
67	58
68	147
69	63
70	165
71	73
72	187
73	83
74	208
75	90

n	a(n)
0	1
1	1
2	1
3	0
4	1
5	0
6	1
7	1
8	2
9	1
10	2
11	1
12	2
13	1
14	3
15	1
16	4
17	2
18	5
19	2
20	5
21	2
22	6
23	3
24	8
25	4
26	9
27	4
28	10
29	4
30	12
31	6
32	15
33	7
34	17
35	7
36	19
37	8
38	22
39	10
40	26
41	12
42	30
43	13
44	33
45	14
46	38
47	17
48	45
49	21
50	51
51	22
52	56
53	24
54	64
55	29
56	74
57	33
58	83
59	36
60	92
61	40
62	104
63	46
64	119
65	53
66	133
67	58
68	147
69	63
70	165
71	73
72	187
73	83
74	208
75	90

n	a(n)
0	1
1	1
2	1
3	0
4	1
5	0
6	1
7	1
8	2
9	1
10	2
11	1
12	2
13	1
14	3
15	1
16	4
17	2
18	5
19	2
20	5
21	2
22	6
23	3
24	8
25	4
26	9
27	4
28	10
29	4
30	12
31	6
32	15
33	7
34	17
35	7
36	19
37	8
38	22
39	10
40	26
41	12
42	30
43	13
44	33
45	14
46	38
47	17
48	45
49	21
50	51
51	22
52	56
53	24
54	64
55	29
56	74
57	33
58	83
59	36
60	92
61	40
62	104
63	46
64	119
65	53
66	133
67	58
68	147
69	63
70	165
71	73
72	187
73	83
74	208
75	90