A320313 - cp's OEIS frontend

A320313 Number of ways to write n as the sum of 4 positive integers a, b, c, d such that d < b and a/b - c/d = (a - c)/(b - d).

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

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 2, 0, 2, 0, 1, 1, 0, 1, 1, 2, 1, 1, 2, 0, 2, 1, 3, 1, 2, 2, 1, 1, 2, 3, 2, 2, 3, 2, 2, 1, 4, 1, 4, 2, 2, 3, 5, 3, 3, 2, 5, 1, 4, 2, 4, 5, 4, 3, 3, 4, 4, 3, 3, 3, 6, 2, 5, 4, 7, 3, 9, 3, 4, 3, 5]

cp's OEIS Frontend

A320313 Number of ways to write n as the sum of 4 positive integers a, b, c, d such that d < b and a/b - c/d = (a - c)/(b - d).

Table of values

List of values

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

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

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