A326407 - cp's OEIS frontend

A326407 Minesweeper sequence of positive integers arranged on a 2D grid along a square array that grows by alternately adding a row at its bottom edge and a column at its right edge.

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

[2, -1, -1, 2, -1, 5, -1, 2, 1, 3, -1, 4, -1, 3, 2, 0, -1, 3, -1, 3, 3, 2, -1, 1, 0, 2, 3, 2, -1, 3, -1, 1, 2, 2, 2, 0, -1, 1, 2, 3, -1, 3, -1, 3, 3, 2, -1, 1, 0, 1, 2, 2, -1, 2, 3, 2, 3, 2, -1, 2, -1, 3, 2, 0, 1, 2, -1, 2, 1, 1, -1, 3, -1, 1, 1, 1, 3, 3, -1, 1, 0]

cp's OEIS Frontend

A326407 Minesweeper sequence of positive integers arranged on a 2D grid along a square array that grows by alternately adding a row at its bottom edge and a column at its right edge.

Table of values

List of values

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

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

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