A334218 - cp's OEIS frontend

A334218 Triangle read by rows: T(n,k) is the number of permutations of 1..n arranged in a circle with exactly k descents.

n	a(n)
0	1
1	1
2	0
3	0
4	2
5	0
6	0
7	3
8	3
9	0
10	0
11	4
12	16
13	4
14	0
15	0
16	5
17	55
18	55
19	5
20	0
21	0
22	6
23	156
24	396
25	156
26	6
27	0
28	0
29	7
30	399
31	2114
32	2114
33	399
34	7
35	0
36	0
37	8
38	960
39	9528
40	19328
41	9528
42	960
43	8
44	0
45	0
46	9
47	2223
48	38637
49	140571
50	140571
51	38637
52	2223
53	9
54	0
55	0
56	10
57	5020
58	146080
59	882340
60	1561900
61	882340
62	146080
63	5020
64	10
65	0

[1, 1, 0, 0, 2, 0, 0, 3, 3, 0, 0, 4, 16, 4, 0, 0, 5, 55, 55, 5, 0, 0, 6, 156, 396, 156, 6, 0, 0, 7, 399, 2114, 2114, 399, 7, 0, 0, 8, 960, 9528, 19328, 9528, 960, 8, 0, 0, 9, 2223, 38637, 140571, 140571, 38637, 2223, 9, 0, 0, 10, 5020, 146080, 882340, 1561900, 882340, 146080, 5020, 10, 0]

cp's OEIS Frontend

A334218 Triangle read by rows: T(n,k) is the number of permutations of 1..n arranged in a circle with exactly k descents.

Table of values

List of values