A320312 - cp's OEIS frontend

A320312 Number of ways to write n as the sum of 4 positive integers a, b, c, d such that b != d 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	1
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	2
20	1
21	0
22	5
23	1
24	3
25	1
26	3
27	3
28	2
29	2
30	3
31	4
32	4
33	3
34	5
35	1
36	4
37	4
38	8
39	3
40	6
41	4
42	4
43	4
44	6
45	6
46	7
47	5
48	8
49	5
50	6
51	4
52	11
53	4
54	11
55	6
56	7
57	6
58	13
59	8
60	7
61	8
62	13
63	4
64	11
65	5
66	12
67	10
68	11
69	9
70	11
71	9
72	10
73	10
74	12
75	7
76	18
77	6
78	15
79	10
80	15

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 2, 1, 2, 1, 0, 5, 1, 3, 1, 3, 3, 2, 2, 3, 4, 4, 3, 5, 1, 4, 4, 8, 3, 6, 4, 4, 4, 6, 6, 7, 5, 8, 5, 6, 4, 11, 4, 11, 6, 7, 6, 13, 8, 7, 8, 13, 4, 11, 5, 12, 10, 11, 9, 11, 9, 10, 10, 12, 7, 18, 6, 15, 10, 15]

cp's OEIS Frontend

A320312 Number of ways to write n as the sum of 4 positive integers a, b, c, d such that b != d 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	1
11	0
12	1
13	1
14	0
15	0
16	1
17	2
18	1
19	2
20	1
21	0
22	5
23	1
24	3
25	1
26	3
27	3
28	2
29	2
30	3
31	4
32	4
33	3
34	5
35	1
36	4
37	4
38	8
39	3
40	6
41	4
42	4
43	4
44	6
45	6
46	7
47	5
48	8
49	5
50	6
51	4
52	11
53	4
54	11
55	6
56	7
57	6
58	13
59	8
60	7
61	8
62	13
63	4
64	11
65	5
66	12
67	10
68	11
69	9
70	11
71	9
72	10
73	10
74	12
75	7
76	18
77	6
78	15
79	10
80	15

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

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