A231777 - cp's OEIS frontend

A231777 Number T(n,k) of permutations of [n] with exactly k ascents from odd to even numbers; triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	2
6	8
7	14
8	2
9	54
10	60
11	6
12	162
13	402
14	150
15	6
16	1536
17	2712
18	768
19	24
20	6144
21	19704
22	12744
23	1704
24	24
25	75000
26	183120
27	94320
28	10320
29	120
30	375000
31	1473720
32	1392720
33	365520
34	21720
35	120
36	5598720
37	17522640
38	13631040
39	3011040
40	152640
41	720
42	33592320
43	156250800

[1, 1, 1, 1, 4, 2, 8, 14, 2, 54, 60, 6, 162, 402, 150, 6, 1536, 2712, 768, 24, 6144, 19704, 12744, 1704, 24, 75000, 183120, 94320, 10320, 120, 375000, 1473720, 1392720, 365520, 21720, 120, 5598720, 17522640, 13631040, 3011040, 152640, 720, 33592320, 156250800]

cp's OEIS Frontend

A231777 Number T(n,k) of permutations of [n] with exactly k ascents from odd to even numbers; triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.

Table of values

List of values