A366353 - cp's OEIS frontend

A366353 a(0) = 0; for n > 0, a(n) is the largest taxicab distance on a square spiral between a(n-1) and any previous occurrence 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	2
7	2
8	3
9	0
10	4
11	0
12	4
13	2
14	5
15	0
16	6
17	0
18	6
19	2
20	6
21	4
22	7
23	0
24	6
25	8
26	0
27	7
28	5
29	4
30	8
31	5
32	3
33	4
34	6
35	8
36	10
37	0
38	9
39	0
40	7
41	7
42	8
43	12
44	0
45	7
46	6
47	8
48	10
49	12
50	6
51	10
52	11
53	0
54	9
55	8
56	13
57	0
58	11
59	6
60	9
61	6
62	11
63	10
64	13
65	8
66	12
67	13
68	11
69	10
70	9
71	12
72	8
73	15
74	0
75	13
76	13
77	12
78	11
79	12
80	13
81	16
82	0
83	13
84	15
85	11
86	11
87	10
88	12

[0, 0, 1, 0, 2, 0, 2, 2, 3, 0, 4, 0, 4, 2, 5, 0, 6, 0, 6, 2, 6, 4, 7, 0, 6, 8, 0, 7, 5, 4, 8, 5, 3, 4, 6, 8, 10, 0, 9, 0, 7, 7, 8, 12, 0, 7, 6, 8, 10, 12, 6, 10, 11, 0, 9, 8, 13, 0, 11, 6, 9, 6, 11, 10, 13, 8, 12, 13, 11, 10, 9, 12, 8, 15, 0, 13, 13, 12, 11, 12, 13, 16, 0, 13, 15, 11, 11, 10, 12]

cp's OEIS Frontend

A366353 a(0) = 0; for n > 0, a(n) is the largest taxicab distance on a square spiral between a(n-1) and any previous occurrence 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	2
7	2
8	3
9	0
10	4
11	0
12	4
13	2
14	5
15	0
16	6
17	0
18	6
19	2
20	6
21	4
22	7
23	0
24	6
25	8
26	0
27	7
28	5
29	4
30	8
31	5
32	3
33	4
34	6
35	8
36	10
37	0
38	9
39	0
40	7
41	7
42	8
43	12
44	0
45	7
46	6
47	8
48	10
49	12
50	6
51	10
52	11
53	0
54	9
55	8
56	13
57	0
58	11
59	6
60	9
61	6
62	11
63	10
64	13
65	8
66	12
67	13
68	11
69	10
70	9
71	12
72	8
73	15
74	0
75	13
76	13
77	12
78	11
79	12
80	13
81	16
82	0
83	13
84	15
85	11
86	11
87	10
88	12

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

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