A366907 - cp's OEIS frontend

A366907 a(n) is the number of geometric progressions with three or more terms, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k), a(n-1-2k),...,a(n-1-tk) where k>=1, t>=2, and n-1-t*k>=0.

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	0
9	4
10	1
11	0
12	1
13	0
14	0
15	2
16	0
17	3
18	0
19	3
20	0
21	6
22	0
23	7
24	0
25	9
26	0
27	13
28	0
29	12
30	0
31	15
32	0
33	21
34	0
35	20
36	0
37	22
38	0
39	30
40	0
41	30
42	0
43	31
44	0
45	38
46	0
47	39
48	0
49	43
50	0
51	47
52	0
53	46
54	0
55	53
56	0
57	61
58	0
59	57
60	0
61	59
62	0
63	69
64	0
65	72
66	0
67	72
68	0
69	78
70	0
71	79
72	0
73	84
74	0
75	91
76	0
77	90
78	0
79	96
80	0
81	103
82	0
83	98
84	0
85	105
86	0
87	116

[0, 0, 0, 1, 0, 1, 0, 2, 0, 4, 1, 0, 1, 0, 0, 2, 0, 3, 0, 3, 0, 6, 0, 7, 0, 9, 0, 13, 0, 12, 0, 15, 0, 21, 0, 20, 0, 22, 0, 30, 0, 30, 0, 31, 0, 38, 0, 39, 0, 43, 0, 47, 0, 46, 0, 53, 0, 61, 0, 57, 0, 59, 0, 69, 0, 72, 0, 72, 0, 78, 0, 79, 0, 84, 0, 91, 0, 90, 0, 96, 0, 103, 0, 98, 0, 105, 0, 116]

cp's OEIS Frontend

A366907 a(n) is the number of geometric progressions with three or more terms, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k), a(n-1-2k),...,a(n-1-tk) where k>=1, t>=2, and n-1-t*k>=0.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	0
9	4
10	1
11	0
12	1
13	0
14	0
15	2
16	0
17	3
18	0
19	3
20	0
21	6
22	0
23	7
24	0
25	9
26	0
27	13
28	0
29	12
30	0
31	15
32	0
33	21
34	0
35	20
36	0
37	22
38	0
39	30
40	0
41	30
42	0
43	31
44	0
45	38
46	0
47	39
48	0
49	43
50	0
51	47
52	0
53	46
54	0
55	53
56	0
57	61
58	0
59	57
60	0
61	59
62	0
63	69
64	0
65	72
66	0
67	72
68	0
69	78
70	0
71	79
72	0
73	84
74	0
75	91
76	0
77	90
78	0
79	96
80	0
81	103
82	0
83	98
84	0
85	105
86	0
87	116

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	0
9	4
10	1
11	0
12	1
13	0
14	0
15	2
16	0
17	3
18	0
19	3
20	0
21	6
22	0
23	7
24	0
25	9
26	0
27	13
28	0
29	12
30	0
31	15
32	0
33	21
34	0
35	20
36	0
37	22
38	0
39	30
40	0
41	30
42	0
43	31
44	0
45	38
46	0
47	39
48	0
49	43
50	0
51	47
52	0
53	46
54	0
55	53
56	0
57	61
58	0
59	57
60	0
61	59
62	0
63	69
64	0
65	72
66	0
67	72
68	0
69	78
70	0
71	79
72	0
73	84
74	0
75	91
76	0
77	90
78	0
79	96
80	0
81	103
82	0
83	98
84	0
85	105
86	0
87	116

cp's OEIS Frontend

A366907 a(n) is the number of geometric progressions with three or more terms, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k), a(n-1-2*k),...,a(n-1-t*k) where k>=1, t>=2, and n-1-t*k>=0.

Table of values

List of values

A366907 a(n) is the number of geometric progressions with three or more terms, with rational ratio > 0, formed by the terms a(n-1), a(n-1-k), a(n-1-2k),...,a(n-1-tk) where k>=1, t>=2, and n-1-t*k>=0.

n	a(n)
0	0
1	0
2	0
3	1
4	0
5	1
6	0
7	2
8	0
9	4
10	1
11	0
12	1
13	0
14	0
15	2
16	0
17	3
18	0
19	3
20	0
21	6
22	0
23	7
24	0
25	9
26	0
27	13
28	0
29	12
30	0
31	15
32	0
33	21
34	0
35	20
36	0
37	22
38	0
39	30
40	0
41	30
42	0
43	31
44	0
45	38
46	0
47	39
48	0
49	43
50	0
51	47
52	0
53	46
54	0
55	53
56	0
57	61
58	0
59	57
60	0
61	59
62	0
63	69
64	0
65	72
66	0
67	72
68	0
69	78
70	0
71	79
72	0
73	84
74	0
75	91
76	0
77	90
78	0
79	96
80	0
81	103
82	0
83	98
84	0
85	105
86	0
87	116