A273821 - cp's OEIS frontend

A273821 Triangle read by rows: T(n,k) is the number of 123-avoiding permutations p of [n] (A000108) such that k is maximal with the property that the k largest entries of p, taken in order, avoid 132.

n	a(n)
1	1
2	0
3	2
4	0
5	1
6	4
7	0
8	3
9	3
10	8
11	0
12	9
13	10
14	7
15	16
16	0
17	28
18	32
19	25
20	15
21	32
22	0
23	90
24	104
25	84
26	56
27	31
28	64
29	0
30	297
31	345
32	283
33	195
34	119
35	63
36	128
37	0
38	1001
39	1166
40	965
41	676
42	425
43	246
44	127
45	256
46	0
47	3432
48	4004
49	3333
50	2359
51	1506
52	894
53	501
54	255
55	512

[1, 0, 2, 0, 1, 4, 0, 3, 3, 8, 0, 9, 10, 7, 16, 0, 28, 32, 25, 15, 32, 0, 90, 104, 84, 56, 31, 64, 0, 297, 345, 283, 195, 119, 63, 128, 0, 1001, 1166, 965, 676, 425, 246, 127, 256, 0, 3432, 4004, 3333, 2359, 1506, 894, 501, 255, 512]

cp's OEIS Frontend

A273821 Triangle read by rows: T(n,k) is the number of 123-avoiding permutations p of [n] (A000108) such that k is maximal with the property that the k largest entries of p, taken in order, avoid 132.

Table of values

List of values