A355851 - cp's OEIS frontend

A355851 The difference between the indices of the two most recent instances of a(n-1), not including a(n-1) itself, or 0 if not enough such instances exist.

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

[0, 0, 0, 1, 0, 1, 0, 2, 0, 2, 0, 2, 2, 2, 1, 2, 1, 9, 0, 2, 2, 4, 0, 8, 0, 4, 0, 2, 1, 2, 7, 0, 2, 2, 3, 0, 5, 0, 4, 4, 13, 0, 2, 1, 12, 0, 4, 1, 15, 0, 4, 7, 0, 4, 4, 3, 0, 3, 21, 0, 4, 1, 4, 6, 0, 3, 2, 9, 0, 5, 0, 4, 2, 24, 0, 2, 6, 0, 4, 9, 50, 0, 3, 8, 0, 4, 7, 21, 0, 3, 17]

cp's OEIS Frontend

A355851 The difference between the indices of the two most recent instances of a(n-1), not including a(n-1) itself, or 0 if not enough such instances exist.

Table of values

List of values

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

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

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