A278778 - cp's OEIS frontend

A278778 T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	0
7	1
8	20
9	20
10	1
11	6
12	117
13	266
14	117
15	6
16	21
17	503
18	1972
19	1972
20	503
21	21
22	56
23	1750
24	10784
25	19750
26	10784
27	1750
28	56
29	126
30	5209
31	48501
32	150085
33	150085
34	48501
35	5209
36	126
37	252
38	13751
39	189595
40	955347
41	1673658
42	955347
43	189595
44	13751
45	252
46	462
47	33000

[0, 0, 0, 0, 2, 0, 1, 20, 20, 1, 6, 117, 266, 117, 6, 21, 503, 1972, 1972, 503, 21, 56, 1750, 10784, 19750, 10784, 1750, 56, 126, 5209, 48501, 150085, 150085, 48501, 5209, 126, 252, 13751, 189595, 955347, 1673658, 955347, 189595, 13751, 252, 462, 33000]

cp's OEIS Frontend

A278778 T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

Table of values

List of values