A230797 - cp's OEIS frontend

A230797 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, up, down; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-3)/2)), read by rows.

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	104
6	16
7	528
8	192
9	3296
10	1472
11	272
12	23168
13	12800
14	4352
15	179712
16	132352
17	42880
18	7936
19	1573632
20	1366016
21	530432
22	158720
23	15207424
24	14781952
25	7662336
26	1911296
27	353792
28	158880768
29	178102272
30	101713920
31	31813632
32	8491008
33	1801996288
34	2282645504

[1, 1, 2, 6, 24, 104, 16, 528, 192, 3296, 1472, 272, 23168, 12800, 4352, 179712, 132352, 42880, 7936, 1573632, 1366016, 530432, 158720, 15207424, 14781952, 7662336, 1911296, 353792, 158880768, 178102272, 101713920, 31813632, 8491008, 1801996288, 2282645504]

cp's OEIS Frontend

A230797 Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, up, down; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-3)/2)), read by rows.

Table of values

List of values