A201375 - cp's OEIS frontend

A201375 T(n,k)=Number of nXk 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

n	a(n)
1	2
2	2
3	2
4	2
5	3
6	2
7	2
8	4
9	4
10	2
11	2
12	5
13	8
14	5
15	2
16	2
17	6
18	14
19	14
20	6
21	2
22	2
23	7
24	22
25	36
26	22
27	7
28	2
29	2
30	8
31	32
32	80
33	80
34	32
35	8
36	2
37	2
38	9
39	44
40	157
41	268
42	157
43	44
44	9
45	2
46	2
47	10
48	58
49	280
50	786
51	786
52	280
53	58
54	10
55	2
56	2
57	11
58	74
59	464
60	2016
61	3739
62	2016
63	464
64	74
65	11
66	2
67	2
68	12
69	92
70	726
71	4608
72	15574
73	15574
74	4608

[2, 2, 2, 2, 3, 2, 2, 4, 4, 2, 2, 5, 8, 5, 2, 2, 6, 14, 14, 6, 2, 2, 7, 22, 36, 22, 7, 2, 2, 8, 32, 80, 80, 32, 8, 2, 2, 9, 44, 157, 268, 157, 44, 9, 2, 2, 10, 58, 280, 786, 786, 280, 58, 10, 2, 2, 11, 74, 464, 2016, 3739, 2016, 464, 74, 11, 2, 2, 12, 92, 726, 4608, 15574, 15574, 4608]

cp's OEIS Frontend

A201375 T(n,k)=Number of nXk 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

Table of values

List of values