A318408 - cp's OEIS frontend

A318408 Triangle read by rows: T(n,k) is the number of permutations of [n+1] with index in the lexicographic ordering of permutations being congruent to 1 or 5 modulo 6 that have exactly k descents; k > 0.

n	a(n)
0	0
1	0
2	1
3	1
4	1
5	1
6	6
7	1
8	1
9	19
10	19
11	1
12	1
13	48
14	142
15	48
16	1
17	1
18	109
19	730
20	730
21	109
22	1
23	1
24	234
25	3087
26	6796
27	3087
28	234
29	1
30	1
31	487
32	11637
33	48355
34	48355
35	11637
36	487
37	1
38	1
39	996
40	40804
41	291484
42	543030
43	291484
44	40804
45	996
46	1

[0, 0, 1, 1, 1, 1, 6, 1, 1, 19, 19, 1, 1, 48, 142, 48, 1, 1, 109, 730, 730, 109, 1, 1, 234, 3087, 6796, 3087, 234, 1, 1, 487, 11637, 48355, 48355, 11637, 487, 1, 1, 996, 40804, 291484, 543030, 291484, 40804, 996, 1]

cp's OEIS Frontend

A318408 Triangle read by rows: T(n,k) is the number of permutations of [n+1] with index in the lexicographic ordering of permutations being congruent to 1 or 5 modulo 6 that have exactly k descents; k > 0.

Table of values

List of values