A242819 - cp's OEIS frontend

A242819 Number T(n,k) of permutations of [n] with exactly k occurrences of the consecutive step pattern up, down, down; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/3)), read by rows.

n	a(n)
0	1
1	1
2	2
3	6
4	21
5	3
6	90
7	30
8	450
9	270
10	2619
11	2322
12	99
13	17334
14	20772
15	2214
16	129114
17	195372
18	38394
19	1067661
20	1958337
21	591543
22	11259
23	9713682
24	20933154
25	8826246
26	443718
27	96393726
28	238789782
29	131367258
30	12450834
31	1036348587
32	2900868876
33	1989555210
34	297195804
35	3052323

[1, 1, 2, 6, 21, 3, 90, 30, 450, 270, 2619, 2322, 99, 17334, 20772, 2214, 129114, 195372, 38394, 1067661, 1958337, 591543, 11259, 9713682, 20933154, 8826246, 443718, 96393726, 238789782, 131367258, 12450834, 1036348587, 2900868876, 1989555210, 297195804, 3052323]

cp's OEIS Frontend

A242819 Number T(n,k) of permutations of [n] with exactly k occurrences of the consecutive step pattern up, down, down; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/3)), read by rows.

Table of values

List of values