A242784 - cp's OEIS frontend

A242784 Number A(n,k) of permutations of [n] avoiding the consecutive step pattern given by the binary expansion of k, where 1=up and 0=down; square array A(n,k), n>=0, k>=0, read by antidiagonals.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	2
18	4
19	1
20	1
21	1
22	1
23	2
24	5
25	8
26	1
27	1
28	1
29	1
30	2
31	6
32	17
33	16
34	1
35	1
36	1
37	1
38	2
39	6
40	21
41	70
42	32
43	1
44	1
45	1
46	1
47	2
48	6
49	19
50	90
51	349
52	64
53	1
54	1
55	1
56	1
57	2
58	6
59	21
60	70
61	450
62	2017
63	128
64	1
65	1
66	1
67	1
68	2
69	6
70	23
71	90
72	331
73	2619
74	13358
75	256
76	1
77	1

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 4, 1, 1, 1, 1, 2, 5, 8, 1, 1, 1, 1, 2, 6, 17, 16, 1, 1, 1, 1, 2, 6, 21, 70, 32, 1, 1, 1, 1, 2, 6, 19, 90, 349, 64, 1, 1, 1, 1, 2, 6, 21, 70, 450, 2017, 128, 1, 1, 1, 1, 2, 6, 23, 90, 331, 2619, 13358, 256, 1, 1]

cp's OEIS Frontend

A242784 Number A(n,k) of permutations of [n] avoiding the consecutive step pattern given by the binary expansion of k, where 1=up and 0=down; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Table of values

List of values