A230695 - cp's OEIS frontend

A230695 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, down, up; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-2)/3)), read by rows.

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	109
6	11
7	588
8	132
9	3654
10	1386
11	26125
12	13606
13	589
14	209863
15	139714
16	13303
17	1876502
18	1508756
19	243542
20	18441367
21	17429745
22	3953529
23	92159
24	197776850
25	214536114
26	63334182
27	3354454
28	2297242583
29	2815529811
30	1020982869
31	93265537
32	28739304385

[1, 1, 2, 6, 24, 109, 11, 588, 132, 3654, 1386, 26125, 13606, 589, 209863, 139714, 13303, 1876502, 1508756, 243542, 18441367, 17429745, 3953529, 92159, 197776850, 214536114, 63334182, 3354454, 2297242583, 2815529811, 1020982869, 93265537, 28739304385]

cp's OEIS Frontend

A230695 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, down, up; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-2)/3)), read by rows.

Table of values

List of values