A308881 - cp's OEIS frontend

A308881 Irregular array read by rows: row k (k>=1) contains k^2 numbers, formed by filling in a k X k square by upwards antidiagonals 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	2
4	1
5	3
6	0
7	2
8	1
9	1
10	3
11	4
12	2
13	0
14	5
15	0
16	2
17	1
18	5
19	1
20	3
21	4
22	0
23	2
24	0
25	5
26	1
27	3
28	1
29	2
30	4
31	0
32	2
33	1
34	5
35	3
36	1
37	3
38	4
39	0
40	6
41	2
42	0
43	5
44	1
45	7
46	3
47	1
48	2
49	4
50	0
51	4
52	5
53	0
54	3
55	1
56	0
57	2
58	1
59	5
60	3
61	4
62	1
63	3
64	4
65	0
66	7
67	2
68	2
69	0
70	5
71	1
72	6
73	9
74	3
75	1
76	2
77	4
78	0
79	5
80	4
81	6
82	0
83	3
84	1
85	7
86	5
87	7
88	8
89	6
90	4
91	10

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

cp's OEIS Frontend

A308881 Irregular array read by rows: row k (k>=1) contains k^2 numbers, formed by filling in a k X k square by upwards antidiagonals 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	2
4	1
5	3
6	0
7	2
8	1
9	1
10	3
11	4
12	2
13	0
14	5
15	0
16	2
17	1
18	5
19	1
20	3
21	4
22	0
23	2
24	0
25	5
26	1
27	3
28	1
29	2
30	4
31	0
32	2
33	1
34	5
35	3
36	1
37	3
38	4
39	0
40	6
41	2
42	0
43	5
44	1
45	7
46	3
47	1
48	2
49	4
50	0
51	4
52	5
53	0
54	3
55	1
56	0
57	2
58	1
59	5
60	3
61	4
62	1
63	3
64	4
65	0
66	7
67	2
68	2
69	0
70	5
71	1
72	6
73	9
74	3
75	1
76	2
77	4
78	0
79	5
80	4
81	6
82	0
83	3
84	1
85	7
86	5
87	7
88	8
89	6
90	4
91	10

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

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