A215292 - cp's OEIS frontend

A215292 T(n,k)=Number of permutations of 0..floor((n*k-1)/2) on even squares of an nXk array such that each row and column of even squares is increasing.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	3
9	3
10	1
11	1
12	6
13	10
14	6
15	1
16	1
17	10
18	30
19	30
20	10
21	1
22	1
23	20
24	140
25	280
26	140
27	20
28	1
29	1
30	35
31	420
32	2100
33	2100
34	420
35	35
36	1
37	1
38	70
39	2310
40	23100
41	60060
42	23100
43	2310
44	70
45	1
46	1
47	126
48	6930
49	210210
50	1051050
51	1051050
52	210210
53	6930
54	126
55	1
56	1
57	252
58	42042
59	2522520

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 6, 10, 6, 1, 1, 10, 30, 30, 10, 1, 1, 20, 140, 280, 140, 20, 1, 1, 35, 420, 2100, 2100, 420, 35, 1, 1, 70, 2310, 23100, 60060, 23100, 2310, 70, 1, 1, 126, 6930, 210210, 1051050, 1051050, 210210, 6930, 126, 1, 1, 252, 42042, 2522520]

cp's OEIS Frontend

A215292 T(n,k)=Number of permutations of 0..floor((n*k-1)/2) on even squares of an nXk array such that each row and column of even squares is increasing.

Table of values

List of values