A145882 - cp's OEIS frontend

A145882 Triangle read by rows: T(n,k) is the number of even permutations of {1,2,...,n} having k descents (n >= 1, k >= 0).

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	5
7	5
8	1
9	1
10	14
11	30
12	14
13	1
14	1
15	29
16	147
17	155
18	28
19	1
20	64
21	586
22	1208
23	605
24	56
25	1
26	127
27	2133
28	7819
29	7819
30	2133
31	127
32	1
33	1
34	262
35	7288
36	44074
37	78190
38	44074
39	7288
40	262
41	1
42	1
43	517
44	23893
45	227569
46	655315
47	655039
48	227623
49	23947
50	496
51	1
52	1044
53	76332
54	1101420

[1, 1, 1, 2, 1, 5, 5, 1, 1, 14, 30, 14, 1, 1, 29, 147, 155, 28, 1, 64, 586, 1208, 605, 56, 1, 127, 2133, 7819, 7819, 2133, 127, 1, 1, 262, 7288, 44074, 78190, 44074, 7288, 262, 1, 1, 517, 23893, 227569, 655315, 655039, 227623, 23947, 496, 1, 1044, 76332, 1101420]

cp's OEIS Frontend

A145882 Triangle read by rows: T(n,k) is the number of even permutations of {1,2,...,n} having k descents (n >= 1, k >= 0).

Table of values

List of values