A245251 - cp's OEIS frontend

A245251 Triangle T(a,b) read by rows: sum_{k=1..a-1} floor(k*b/a).

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	3
7	0
8	2
9	3
10	6
11	0
12	2
13	4
14	6
15	10
16	0
17	3
18	6
19	8
20	10
21	15
22	0
23	3
24	6
25	9
26	12
27	15
28	21
29	0
30	4
31	7
32	12
33	14
34	18
35	21
36	28
37	0
38	4
39	9
40	12
41	16
42	21
43	24
44	28
45	36
46	0
47	5
48	9
49	14
50	20
51	23
52	27
53	32
54	36
55	45
56	0
57	5
58	10
59	15
60	20
61	25
62	30
63	35
64	40
65	45
66	55
67	0
68	6
69	12
70	18
71	22
72	30
73	33
74	40
75	45
76	50
77	55
78	66
79	0
80	6
81	12
82	18
83	24
84	30
85	36
86	45

[0, 0, 1, 0, 1, 3, 0, 2, 3, 6, 0, 2, 4, 6, 10, 0, 3, 6, 8, 10, 15, 0, 3, 6, 9, 12, 15, 21, 0, 4, 7, 12, 14, 18, 21, 28, 0, 4, 9, 12, 16, 21, 24, 28, 36, 0, 5, 9, 14, 20, 23, 27, 32, 36, 45, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 55, 0, 6, 12, 18, 22, 30, 33, 40, 45, 50, 55, 66, 0, 6, 12, 18, 24, 30, 36, 45]

cp's OEIS Frontend

A245251 Triangle T(a,b) read by rows: sum_{k=1..a-1} floor(k*b/a).

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	3
7	0
8	2
9	3
10	6
11	0
12	2
13	4
14	6
15	10
16	0
17	3
18	6
19	8
20	10
21	15
22	0
23	3
24	6
25	9
26	12
27	15
28	21
29	0
30	4
31	7
32	12
33	14
34	18
35	21
36	28
37	0
38	4
39	9
40	12
41	16
42	21
43	24
44	28
45	36
46	0
47	5
48	9
49	14
50	20
51	23
52	27
53	32
54	36
55	45
56	0
57	5
58	10
59	15
60	20
61	25
62	30
63	35
64	40
65	45
66	55
67	0
68	6
69	12
70	18
71	22
72	30
73	33
74	40
75	45
76	50
77	55
78	66
79	0
80	6
81	12
82	18
83	24
84	30
85	36
86	45

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	3
7	0
8	2
9	3
10	6
11	0
12	2
13	4
14	6
15	10
16	0
17	3
18	6
19	8
20	10
21	15
22	0
23	3
24	6
25	9
26	12
27	15
28	21
29	0
30	4
31	7
32	12
33	14
34	18
35	21
36	28
37	0
38	4
39	9
40	12
41	16
42	21
43	24
44	28
45	36
46	0
47	5
48	9
49	14
50	20
51	23
52	27
53	32
54	36
55	45
56	0
57	5
58	10
59	15
60	20
61	25
62	30
63	35
64	40
65	45
66	55
67	0
68	6
69	12
70	18
71	22
72	30
73	33
74	40
75	45
76	50
77	55
78	66
79	0
80	6
81	12
82	18
83	24
84	30
85	36
86	45

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	3
7	0
8	2
9	3
10	6
11	0
12	2
13	4
14	6
15	10
16	0
17	3
18	6
19	8
20	10
21	15
22	0
23	3
24	6
25	9
26	12
27	15
28	21
29	0
30	4
31	7
32	12
33	14
34	18
35	21
36	28
37	0
38	4
39	9
40	12
41	16
42	21
43	24
44	28
45	36
46	0
47	5
48	9
49	14
50	20
51	23
52	27
53	32
54	36
55	45
56	0
57	5
58	10
59	15
60	20
61	25
62	30
63	35
64	40
65	45
66	55
67	0
68	6
69	12
70	18
71	22
72	30
73	33
74	40
75	45
76	50
77	55
78	66
79	0
80	6
81	12
82	18
83	24
84	30
85	36
86	45