A366354 - cp's OEIS frontend

A366354 a(0) = 0; for n > 0, a(n) is the largest taxicab distance 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	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	4
33	8
34	8
35	9
36	0
37	10
38	0
39	10
40	2
41	7
42	8
43	12
44	0
45	10
46	8
47	12
48	4
49	8
50	12
51	7
52	8
53	12
54	10
55	9
56	6
57	12
58	12
59	12
60	12
61	12
62	12
63	12
64	13
65	0
66	11
67	0
68	11
69	2
70	8
71	12
72	14
73	0
74	11
75	8
76	12
77	14
78	5
79	8
80	12
81	15
82	0
83	15
84	2
85	9
86	10
87	9
88	10
89	11

[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, 4, 8, 8, 9, 0, 10, 0, 10, 2, 7, 8, 12, 0, 10, 8, 12, 4, 8, 12, 7, 8, 12, 10, 9, 6, 12, 12, 12, 12, 12, 12, 12, 13, 0, 11, 0, 11, 2, 8, 12, 14, 0, 11, 8, 12, 14, 5, 8, 12, 15, 0, 15, 2, 9, 10, 9, 10, 11]

cp's OEIS Frontend

A366354 a(0) = 0; for n > 0, a(n) is the largest taxicab distance 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	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	4
33	8
34	8
35	9
36	0
37	10
38	0
39	10
40	2
41	7
42	8
43	12
44	0
45	10
46	8
47	12
48	4
49	8
50	12
51	7
52	8
53	12
54	10
55	9
56	6
57	12
58	12
59	12
60	12
61	12
62	12
63	12
64	13
65	0
66	11
67	0
68	11
69	2
70	8
71	12
72	14
73	0
74	11
75	8
76	12
77	14
78	5
79	8
80	12
81	15
82	0
83	15
84	2
85	9
86	10
87	9
88	10
89	11

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	4
33	8
34	8
35	9
36	0
37	10
38	0
39	10
40	2
41	7
42	8
43	12
44	0
45	10
46	8
47	12
48	4
49	8
50	12
51	7
52	8
53	12
54	10
55	9
56	6
57	12
58	12
59	12
60	12
61	12
62	12
63	12
64	13
65	0
66	11
67	0
68	11
69	2
70	8
71	12
72	14
73	0
74	11
75	8
76	12
77	14
78	5
79	8
80	12
81	15
82	0
83	15
84	2
85	9
86	10
87	9
88	10
89	11

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	4
33	8
34	8
35	9
36	0
37	10
38	0
39	10
40	2
41	7
42	8
43	12
44	0
45	10
46	8
47	12
48	4
49	8
50	12
51	7
52	8
53	12
54	10
55	9
56	6
57	12
58	12
59	12
60	12
61	12
62	12
63	12
64	13
65	0
66	11
67	0
68	11
69	2
70	8
71	12
72	14
73	0
74	11
75	8
76	12
77	14
78	5
79	8
80	12
81	15
82	0
83	15
84	2
85	9
86	10
87	9
88	10
89	11