A265129 - cp's OEIS frontend

A265129 Triangle read by rows, formed as the sum of the two versions of the natural numbers filling an equilateral triangle.

n	a(n)
1	2
2	5
3	5
4	10
5	10
6	10
7	17
8	17
9	17
10	17
11	26
12	26
13	26
14	26
15	26
16	37
17	37
18	37
19	37
20	37
21	37
22	50
23	50
24	50
25	50
26	50
27	50
28	50
29	65
30	65
31	65
32	65
33	65
34	65
35	65
36	65
37	82
38	82
39	82
40	82
41	82
42	82
43	82
44	82
45	82
46	101
47	101
48	101
49	101
50	101
51	101
52	101
53	101
54	101
55	101

[2, 5, 5, 10, 10, 10, 17, 17, 17, 17, 26, 26, 26, 26, 26, 37, 37, 37, 37, 37, 37, 50, 50, 50, 50, 50, 50, 50, 65, 65, 65, 65, 65, 65, 65, 65, 82, 82, 82, 82, 82, 82, 82, 82, 82, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101]

cp's OEIS Frontend

A265129 Triangle read by rows, formed as the sum of the two versions of the natural numbers filling an equilateral triangle.

Table of values

List of values

n	a(n)
1	2
2	5
3	5
4	10
5	10
6	10
7	17
8	17
9	17
10	17
11	26
12	26
13	26
14	26
15	26
16	37
17	37
18	37
19	37
20	37
21	37
22	50
23	50
24	50
25	50
26	50
27	50
28	50
29	65
30	65
31	65
32	65
33	65
34	65
35	65
36	65
37	82
38	82
39	82
40	82
41	82
42	82
43	82
44	82
45	82
46	101
47	101
48	101
49	101
50	101
51	101
52	101
53	101
54	101
55	101

n	a(n)
1	2
2	5
3	5
4	10
5	10
6	10
7	17
8	17
9	17
10	17
11	26
12	26
13	26
14	26
15	26
16	37
17	37
18	37
19	37
20	37
21	37
22	50
23	50
24	50
25	50
26	50
27	50
28	50
29	65
30	65
31	65
32	65
33	65
34	65
35	65
36	65
37	82
38	82
39	82
40	82
41	82
42	82
43	82
44	82
45	82
46	101
47	101
48	101
49	101
50	101
51	101
52	101
53	101
54	101
55	101

n	a(n)
1	2
2	5
3	5
4	10
5	10
6	10
7	17
8	17
9	17
10	17
11	26
12	26
13	26
14	26
15	26
16	37
17	37
18	37
19	37
20	37
21	37
22	50
23	50
24	50
25	50
26	50
27	50
28	50
29	65
30	65
31	65
32	65
33	65
34	65
35	65
36	65
37	82
38	82
39	82
40	82
41	82
42	82
43	82
44	82
45	82
46	101
47	101
48	101
49	101
50	101
51	101
52	101
53	101
54	101
55	101