A215788 - cp's OEIS frontend

A215788 T(n,k)=Number of permutations of 0..floor((n*k-1)/2) on even squares of an nXk array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	2
18	2
19	1
20	1
21	1
22	1
23	2
24	5
25	2
26	1
27	1
28	1
29	1
30	5
31	12
32	10
33	4
34	1
35	1
36	1
37	1
38	5
39	42
40	29
41	25
42	4
43	1
44	1
45	1
46	1
47	14
48	110
49	262
50	189
51	50
52	8
53	1
54	1
55	1
56	1
57	14
58	462
59	932
60	2465
61	458
62	125
63	8
64	1
65	1
66	1
67	1
68	42
69	1274
70	11694
71	26451
72	15485
73	2988
74	250
75	16
76	1
77	1
78	1
79	1
80	42
81	6006

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 5, 2, 1, 1, 1, 1, 5, 12, 10, 4, 1, 1, 1, 1, 5, 42, 29, 25, 4, 1, 1, 1, 1, 14, 110, 262, 189, 50, 8, 1, 1, 1, 1, 14, 462, 932, 2465, 458, 125, 8, 1, 1, 1, 1, 42, 1274, 11694, 26451, 15485, 2988, 250, 16, 1, 1, 1, 1, 42, 6006]

cp's OEIS Frontend

A215788 T(n,k)=Number of permutations of 0..floor((n*k-1)/2) on even squares of an nXk array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.

Table of values

List of values