A227884 - cp's OEIS frontend

A227884 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, up; triangle T(n,k), n>=0, 0<=k<=max(0,floor(n/2)-1), read by rows.

n	a(n)
0	1
1	1
2	2
3	6
4	19
5	5
6	70
7	50
8	331
9	328
10	61
11	1863
12	2154
13	1023
14	11637
15	16751
16	10547
17	1385
18	81110
19	144840
20	102030
21	34900
22	635550
23	1314149
24	1109973
25	518607
26	50521
27	5495339
28	12735722
29	13046040
30	6858598
31	1781101
32	51590494
33	134159743
34	157195762
35	97348436
36	36004400

[1, 1, 2, 6, 19, 5, 70, 50, 331, 328, 61, 1863, 2154, 1023, 11637, 16751, 10547, 1385, 81110, 144840, 102030, 34900, 635550, 1314149, 1109973, 518607, 50521, 5495339, 12735722, 13046040, 6858598, 1781101, 51590494, 134159743, 157195762, 97348436, 36004400]

cp's OEIS Frontend

A227884 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, up; triangle T(n,k), n>=0, 0<=k<=max(0,floor(n/2)-1), read by rows.

Table of values

List of values