A071690 - cp's OEIS frontend

A071690 Number of ways to write n as n = xyz*t/(x+y+z+t) with 1 <= x <= y <= z <= t <= n.

n	a(n)
0	0
1	0
2	1
3	0
4	1
5	1
6	2
7	1
8	3
9	2
10	6
11	1
12	8
13	1
14	7
15	6
16	9
17	1
18	15
19	1
20	10
21	5
22	8
23	2
24	21
25	5
26	10
27	6
28	15
29	2
30	28
31	1
32	16
33	8
34	11
35	11
36	27
37	2
38	9
39	6
40	30
41	1
42	35
43	3
44	18
45	17
46	9
47	3
48	43
49	8
50	30
51	8
52	17
53	2
54	51
55	8
56	32
57	7
58	14
59	2
60	55
61	2
62	10
63	20
64	37
65	14
66	40
67	2
68	19
69	10
70	50
71	2
72	65
73	2
74	13
75	31
76	21
77	9
78	46
79	2
80	57
81	19
82	15
83	3
84	67
85	11
86	11
87	9
88	41
89	2
90	89
91	15
92	22
93	12

[0, 0, 1, 0, 1, 1, 2, 1, 3, 2, 6, 1, 8, 1, 7, 6, 9, 1, 15, 1, 10, 5, 8, 2, 21, 5, 10, 6, 15, 2, 28, 1, 16, 8, 11, 11, 27, 2, 9, 6, 30, 1, 35, 3, 18, 17, 9, 3, 43, 8, 30, 8, 17, 2, 51, 8, 32, 7, 14, 2, 55, 2, 10, 20, 37, 14, 40, 2, 19, 10, 50, 2, 65, 2, 13, 31, 21, 9, 46, 2, 57, 19, 15, 3, 67, 11, 11, 9, 41, 2, 89, 15, 22, 12]

cp's OEIS Frontend

A071690 Number of ways to write n as n = xyz*t/(x+y+z+t) with 1 <= x <= y <= z <= t <= n.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	1
5	1
6	2
7	1
8	3
9	2
10	6
11	1
12	8
13	1
14	7
15	6
16	9
17	1
18	15
19	1
20	10
21	5
22	8
23	2
24	21
25	5
26	10
27	6
28	15
29	2
30	28
31	1
32	16
33	8
34	11
35	11
36	27
37	2
38	9
39	6
40	30
41	1
42	35
43	3
44	18
45	17
46	9
47	3
48	43
49	8
50	30
51	8
52	17
53	2
54	51
55	8
56	32
57	7
58	14
59	2
60	55
61	2
62	10
63	20
64	37
65	14
66	40
67	2
68	19
69	10
70	50
71	2
72	65
73	2
74	13
75	31
76	21
77	9
78	46
79	2
80	57
81	19
82	15
83	3
84	67
85	11
86	11
87	9
88	41
89	2
90	89
91	15
92	22
93	12

n	a(n)
0	0
1	0
2	1
3	0
4	1
5	1
6	2
7	1
8	3
9	2
10	6
11	1
12	8
13	1
14	7
15	6
16	9
17	1
18	15
19	1
20	10
21	5
22	8
23	2
24	21
25	5
26	10
27	6
28	15
29	2
30	28
31	1
32	16
33	8
34	11
35	11
36	27
37	2
38	9
39	6
40	30
41	1
42	35
43	3
44	18
45	17
46	9
47	3
48	43
49	8
50	30
51	8
52	17
53	2
54	51
55	8
56	32
57	7
58	14
59	2
60	55
61	2
62	10
63	20
64	37
65	14
66	40
67	2
68	19
69	10
70	50
71	2
72	65
73	2
74	13
75	31
76	21
77	9
78	46
79	2
80	57
81	19
82	15
83	3
84	67
85	11
86	11
87	9
88	41
89	2
90	89
91	15
92	22
93	12

cp's OEIS Frontend

A071690 Number of ways to write n as n = x*y*z*t/(x+y+z+t) with 1 <= x <= y <= z <= t <= n.

Table of values

List of values

A071690 Number of ways to write n as n = xyz*t/(x+y+z+t) with 1 <= x <= y <= z <= t <= n.

n	a(n)
0	0
1	0
2	1
3	0
4	1
5	1
6	2
7	1
8	3
9	2
10	6
11	1
12	8
13	1
14	7
15	6
16	9
17	1
18	15
19	1
20	10
21	5
22	8
23	2
24	21
25	5
26	10
27	6
28	15
29	2
30	28
31	1
32	16
33	8
34	11
35	11
36	27
37	2
38	9
39	6
40	30
41	1
42	35
43	3
44	18
45	17
46	9
47	3
48	43
49	8
50	30
51	8
52	17
53	2
54	51
55	8
56	32
57	7
58	14
59	2
60	55
61	2
62	10
63	20
64	37
65	14
66	40
67	2
68	19
69	10
70	50
71	2
72	65
73	2
74	13
75	31
76	21
77	9
78	46
79	2
80	57
81	19
82	15
83	3
84	67
85	11
86	11
87	9
88	41
89	2
90	89
91	15
92	22
93	12