A141418 - cp's OEIS frontend

A141418 Triangle read by rows: T(n,k) = k * (2*n - k - 1) / 2, 1 <= k <= n.

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	5
9	6
10	6
11	4
12	7
13	9
14	10
15	10
16	5
17	9
18	12
19	14
20	15
21	15
22	6
23	11
24	15
25	18
26	20
27	21
28	21
29	7
30	13
31	18
32	22
33	25
34	27
35	28
36	28
37	8
38	15
39	21
40	26
41	30
42	33
43	35
44	36
45	36
46	9
47	17
48	24
49	30
50	35
51	39
52	42
53	44
54	45
55	45

[0, 1, 1, 2, 3, 3, 3, 5, 6, 6, 4, 7, 9, 10, 10, 5, 9, 12, 14, 15, 15, 6, 11, 15, 18, 20, 21, 21, 7, 13, 18, 22, 25, 27, 28, 28, 8, 15, 21, 26, 30, 33, 35, 36, 36, 9, 17, 24, 30, 35, 39, 42, 44, 45, 45]

cp's OEIS Frontend

A141418 Triangle read by rows: T(n,k) = k * (2*n - k - 1) / 2, 1 <= k <= n.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	5
9	6
10	6
11	4
12	7
13	9
14	10
15	10
16	5
17	9
18	12
19	14
20	15
21	15
22	6
23	11
24	15
25	18
26	20
27	21
28	21
29	7
30	13
31	18
32	22
33	25
34	27
35	28
36	28
37	8
38	15
39	21
40	26
41	30
42	33
43	35
44	36
45	36
46	9
47	17
48	24
49	30
50	35
51	39
52	42
53	44
54	45
55	45

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	5
9	6
10	6
11	4
12	7
13	9
14	10
15	10
16	5
17	9
18	12
19	14
20	15
21	15
22	6
23	11
24	15
25	18
26	20
27	21
28	21
29	7
30	13
31	18
32	22
33	25
34	27
35	28
36	28
37	8
38	15
39	21
40	26
41	30
42	33
43	35
44	36
45	36
46	9
47	17
48	24
49	30
50	35
51	39
52	42
53	44
54	45
55	45

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	3
7	3
8	5
9	6
10	6
11	4
12	7
13	9
14	10
15	10
16	5
17	9
18	12
19	14
20	15
21	15
22	6
23	11
24	15
25	18
26	20
27	21
28	21
29	7
30	13
31	18
32	22
33	25
34	27
35	28
36	28
37	8
38	15
39	21
40	26
41	30
42	33
43	35
44	36
45	36
46	9
47	17
48	24
49	30
50	35
51	39
52	42
53	44
54	45
55	45