A049777 - cp's OEIS frontend

A049777 Triangular array read by rows: T(m,n) = n + n+1 + ... + m = (m+n)(m-n+1)/2.

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

[1, 3, 2, 6, 5, 3, 10, 9, 7, 4, 15, 14, 12, 9, 5, 21, 20, 18, 15, 11, 6, 28, 27, 25, 22, 18, 13, 7, 36, 35, 33, 30, 26, 21, 15, 8, 45, 44, 42, 39, 35, 30, 24, 17, 9, 55, 54, 52, 49, 45, 40, 34, 27, 19, 10, 66, 65, 63, 60, 56, 51, 45, 38, 30, 21, 11, 78, 77, 75, 72, 68, 63, 57, 50]

cp's OEIS Frontend

A049777 Triangular array read by rows: T(m,n) = n + n+1 + ... + m = (m+n)(m-n+1)/2.

Table of values

List of values

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

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

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