A133825 - cp's OEIS frontend

A133825 Triangle whose rows are sequences of increasing and decreasing triangular numbers: 1; 1,3,1; 1,3,6,3,1; ... .

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

[1, 1, 3, 1, 1, 3, 6, 3, 1, 1, 3, 6, 10, 6, 3, 1, 1, 3, 6, 10, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 28, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 28, 36, 28, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10, 15, 21, 28, 36, 45, 36, 28, 21, 15, 10, 6, 3, 1, 1, 3, 6, 10]

cp's OEIS Frontend

A133825 Triangle whose rows are sequences of increasing and decreasing triangular numbers: 1; 1,3,1; 1,3,6,3,1; ... .

Table of values

List of values

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

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

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