A308880 - cp's OEIS frontend

A308880 Irregular array read by rows: row k (k>=1) contains k^2 numbers, formed by filling in a k X k square by rows so entries in all rows, columns, diagonals, antidiagonals are distinct, and then reading that square across rows.

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	0
7	1
8	2
9	2
10	3
11	0
12	1
13	4
14	5
15	0
16	1
17	2
18	3
19	2
20	3
21	0
22	1
23	1
24	4
25	5
26	2
27	5
28	0
29	1
30	4
31	0
32	1
33	2
34	3
35	4
36	2
37	3
38	0
39	1
40	5
41	1
42	4
43	5
44	2
45	0
46	5
47	0
48	1
49	4
50	3
51	3
52	6
53	7
54	0
55	1
56	0
57	1
58	2
59	3
60	4
61	5
62	2
63	3
64	0
65	1
66	6
67	7
68	1
69	4
70	5
71	2
72	0
73	8
74	5
75	0
76	1
77	4
78	3
79	6
80	3
81	7
82	6
83	0
84	1
85	4
86	4
87	2
88	9
89	5
90	7
91	10

[0, 0, 1, 2, 3, 0, 1, 2, 2, 3, 0, 1, 4, 5, 0, 1, 2, 3, 2, 3, 0, 1, 1, 4, 5, 2, 5, 0, 1, 4, 0, 1, 2, 3, 4, 2, 3, 0, 1, 5, 1, 4, 5, 2, 0, 5, 0, 1, 4, 3, 3, 6, 7, 0, 1, 0, 1, 2, 3, 4, 5, 2, 3, 0, 1, 6, 7, 1, 4, 5, 2, 0, 8, 5, 0, 1, 4, 3, 6, 3, 7, 6, 0, 1, 4, 4, 2, 9, 5, 7, 10]

cp's OEIS Frontend

A308880 Irregular array read by rows: row k (k>=1) contains k^2 numbers, formed by filling in a k X k square by rows so entries in all rows, columns, diagonals, antidiagonals are distinct, and then reading that square across rows.

Table of values

List of values

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	0
7	1
8	2
9	2
10	3
11	0
12	1
13	4
14	5
15	0
16	1
17	2
18	3
19	2
20	3
21	0
22	1
23	1
24	4
25	5
26	2
27	5
28	0
29	1
30	4
31	0
32	1
33	2
34	3
35	4
36	2
37	3
38	0
39	1
40	5
41	1
42	4
43	5
44	2
45	0
46	5
47	0
48	1
49	4
50	3
51	3
52	6
53	7
54	0
55	1
56	0
57	1
58	2
59	3
60	4
61	5
62	2
63	3
64	0
65	1
66	6
67	7
68	1
69	4
70	5
71	2
72	0
73	8
74	5
75	0
76	1
77	4
78	3
79	6
80	3
81	7
82	6
83	0
84	1
85	4
86	4
87	2
88	9
89	5
90	7
91	10

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	0
7	1
8	2
9	2
10	3
11	0
12	1
13	4
14	5
15	0
16	1
17	2
18	3
19	2
20	3
21	0
22	1
23	1
24	4
25	5
26	2
27	5
28	0
29	1
30	4
31	0
32	1
33	2
34	3
35	4
36	2
37	3
38	0
39	1
40	5
41	1
42	4
43	5
44	2
45	0
46	5
47	0
48	1
49	4
50	3
51	3
52	6
53	7
54	0
55	1
56	0
57	1
58	2
59	3
60	4
61	5
62	2
63	3
64	0
65	1
66	6
67	7
68	1
69	4
70	5
71	2
72	0
73	8
74	5
75	0
76	1
77	4
78	3
79	6
80	3
81	7
82	6
83	0
84	1
85	4
86	4
87	2
88	9
89	5
90	7
91	10

n	a(n)
1	0
2	0
3	1
4	2
5	3
6	0
7	1
8	2
9	2
10	3
11	0
12	1
13	4
14	5
15	0
16	1
17	2
18	3
19	2
20	3
21	0
22	1
23	1
24	4
25	5
26	2
27	5
28	0
29	1
30	4
31	0
32	1
33	2
34	3
35	4
36	2
37	3
38	0
39	1
40	5
41	1
42	4
43	5
44	2
45	0
46	5
47	0
48	1
49	4
50	3
51	3
52	6
53	7
54	0
55	1
56	0
57	1
58	2
59	3
60	4
61	5
62	2
63	3
64	0
65	1
66	6
67	7
68	1
69	4
70	5
71	2
72	0
73	8
74	5
75	0
76	1
77	4
78	3
79	6
80	3
81	7
82	6
83	0
84	1
85	4
86	4
87	2
88	9
89	5
90	7
91	10