A366543 - cp's OEIS frontend

A366543 a(0) = 0; for n > 0, a(n) is the largest distance squared on a square spiral between any two previous occurrences of a(n-1). If a(n-1) has not previously occurred then a(n) = 0.

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	45
48	4
49	45
50	16
51	40
52	53
53	0
54	50
55	0
56	61
57	0
58	65
59	0
60	65
61	4
62	65
63	16
64	85
65	0
66	68
67	0
68	68
69	4
70	65
71	72
72	4
73	73
74	0
75	89
76	0
77	89
78	4
79	73
80	36
81	0
82	130
83	0

[0, 0, 1, 0, 2, 0, 4, 0, 4, 4, 9, 0, 10, 0, 10, 4, 18, 0, 16, 0, 20, 0, 20, 4, 20, 16, 29, 0, 26, 0, 34, 0, 34, 4, 26, 20, 41, 0, 40, 0, 40, 4, 34, 72, 0, 45, 0, 45, 4, 45, 16, 40, 53, 0, 50, 0, 61, 0, 65, 0, 65, 4, 65, 16, 85, 0, 68, 0, 68, 4, 65, 72, 4, 73, 0, 89, 0, 89, 4, 73, 36, 0, 130, 0]

cp's OEIS Frontend

A366543 a(0) = 0; for n > 0, a(n) is the largest distance squared on a square spiral between any two previous occurrences of a(n-1). If a(n-1) has not previously occurred then a(n) = 0.

Table of values

List of values

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	45
48	4
49	45
50	16
51	40
52	53
53	0
54	50
55	0
56	61
57	0
58	65
59	0
60	65
61	4
62	65
63	16
64	85
65	0
66	68
67	0
68	68
69	4
70	65
71	72
72	4
73	73
74	0
75	89
76	0
77	89
78	4
79	73
80	36
81	0
82	130
83	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	45
48	4
49	45
50	16
51	40
52	53
53	0
54	50
55	0
56	61
57	0
58	65
59	0
60	65
61	4
62	65
63	16
64	85
65	0
66	68
67	0
68	68
69	4
70	65
71	72
72	4
73	73
74	0
75	89
76	0
77	89
78	4
79	73
80	36
81	0
82	130
83	0

n	a(n)
0	0
1	0
2	1
3	0
4	2
5	0
6	4
7	0
8	4
9	4
10	9
11	0
12	10
13	0
14	10
15	4
16	18
17	0
18	16
19	0
20	20
21	0
22	20
23	4
24	20
25	16
26	29
27	0
28	26
29	0
30	34
31	0
32	34
33	4
34	26
35	20
36	41
37	0
38	40
39	0
40	40
41	4
42	34
43	72
44	0
45	45
46	0
47	45
48	4
49	45
50	16
51	40
52	53
53	0
54	50
55	0
56	61
57	0
58	65
59	0
60	65
61	4
62	65
63	16
64	85
65	0
66	68
67	0
68	68
69	4
70	65
71	72
72	4
73	73
74	0
75	89
76	0
77	89
78	4
79	73
80	36
81	0
82	130
83	0