A383187 - cp's OEIS frontend

A383187 Diamond spiral number of the n-th point visited by the king moving on the two-dimensional grid always to the earliest unvisited point on the spiral, not immediately preceding or following on the spiral.

n	a(n)
0	0
1	2
2	7
3	1
4	4
5	11
6	3
7	9
8	19
9	8
10	17
11	30
12	16
13	6
14	14
15	5
16	12
17	23
18	38
19	22
20	10
21	20
22	34
23	52
24	33
25	18
26	31
27	48
28	69
29	47
30	29
31	15
32	27
33	43
34	26
35	13
36	24
37	39
38	58
39	81
40	57
41	37
42	21
43	35
44	53
45	75
46	101
47	74
48	51
49	32
50	49
51	70
52	95
53	124
54	94
55	68
56	46
57	28
58	44
59	64
60	88
61	63
62	42
63	25
64	40
65	59
66	82
67	109
68	140
69	108
70	80
71	56
72	36
73	54
74	76

[0, 2, 7, 1, 4, 11, 3, 9, 19, 8, 17, 30, 16, 6, 14, 5, 12, 23, 38, 22, 10, 20, 34, 52, 33, 18, 31, 48, 69, 47, 29, 15, 27, 43, 26, 13, 24, 39, 58, 81, 57, 37, 21, 35, 53, 75, 101, 74, 51, 32, 49, 70, 95, 124, 94, 68, 46, 28, 44, 64, 88, 63, 42, 25, 40, 59, 82, 109, 140, 108, 80, 56, 36, 54, 76]

cp's OEIS Frontend

A383187 Diamond spiral number of the n-th point visited by the king moving on the two-dimensional grid always to the earliest unvisited point on the spiral, not immediately preceding or following on the spiral.

Table of values

List of values

n	a(n)
0	0
1	2
2	7
3	1
4	4
5	11
6	3
7	9
8	19
9	8
10	17
11	30
12	16
13	6
14	14
15	5
16	12
17	23
18	38
19	22
20	10
21	20
22	34
23	52
24	33
25	18
26	31
27	48
28	69
29	47
30	29
31	15
32	27
33	43
34	26
35	13
36	24
37	39
38	58
39	81
40	57
41	37
42	21
43	35
44	53
45	75
46	101
47	74
48	51
49	32
50	49
51	70
52	95
53	124
54	94
55	68
56	46
57	28
58	44
59	64
60	88
61	63
62	42
63	25
64	40
65	59
66	82
67	109
68	140
69	108
70	80
71	56
72	36
73	54
74	76

n	a(n)
0	0
1	2
2	7
3	1
4	4
5	11
6	3
7	9
8	19
9	8
10	17
11	30
12	16
13	6
14	14
15	5
16	12
17	23
18	38
19	22
20	10
21	20
22	34
23	52
24	33
25	18
26	31
27	48
28	69
29	47
30	29
31	15
32	27
33	43
34	26
35	13
36	24
37	39
38	58
39	81
40	57
41	37
42	21
43	35
44	53
45	75
46	101
47	74
48	51
49	32
50	49
51	70
52	95
53	124
54	94
55	68
56	46
57	28
58	44
59	64
60	88
61	63
62	42
63	25
64	40
65	59
66	82
67	109
68	140
69	108
70	80
71	56
72	36
73	54
74	76

n	a(n)
0	0
1	2
2	7
3	1
4	4
5	11
6	3
7	9
8	19
9	8
10	17
11	30
12	16
13	6
14	14
15	5
16	12
17	23
18	38
19	22
20	10
21	20
22	34
23	52
24	33
25	18
26	31
27	48
28	69
29	47
30	29
31	15
32	27
33	43
34	26
35	13
36	24
37	39
38	58
39	81
40	57
41	37
42	21
43	35
44	53
45	75
46	101
47	74
48	51
49	32
50	49
51	70
52	95
53	124
54	94
55	68
56	46
57	28
58	44
59	64
60	88
61	63
62	42
63	25
64	40
65	59
66	82
67	109
68	140
69	108
70	80
71	56
72	36
73	54
74	76