A263789 - cp's OEIS frontend

A263789 Triangle read by rows: T(n,k) (n>=0, 0<=k<=floor(n/2)) is the number of permutations of n and k valleys (considered cyclically).

n	a(n)
0	1
1	1
2	0
3	2
4	0
5	6
6	0
7	16
8	8
9	0
10	40
11	80
12	0
13	96
14	528
15	96
16	0
17	224
18	2912
19	1904
20	0
21	512
22	14592
23	23040
24	2176
25	0
26	1152
27	69120
28	221184
29	71424
30	0
31	2560
32	316160
33	1858560
34	1372160
35	79360
36	0
37	5632
38	1413632
39	14353152
40	20252672
41	3891712
42	0
43	12288
44	6223872
45	104742912

[1, 1, 0, 2, 0, 6, 0, 16, 8, 0, 40, 80, 0, 96, 528, 96, 0, 224, 2912, 1904, 0, 512, 14592, 23040, 2176, 0, 1152, 69120, 221184, 71424, 0, 2560, 316160, 1858560, 1372160, 79360, 0, 5632, 1413632, 14353152, 20252672, 3891712, 0, 12288, 6223872, 104742912]

cp's OEIS Frontend

A263789 Triangle read by rows: T(n,k) (n>=0, 0<=k<=floor(n/2)) is the number of permutations of n and k valleys (considered cyclically).

Table of values

List of values