A232187 - cp's OEIS frontend

A232187 Number T(n,k) of parity alternating permutations of [n] with exactly k descents from odd to even numbers; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/2)), read by rows.

n	a(n)
0	1
1	1
2	2
3	1
4	1
5	5
6	3
7	2
8	8
9	2
10	20
11	44
12	8
13	6
14	66
15	66
16	6
17	114
18	594
19	414
20	30
21	24
22	624
23	1584
24	624
25	24
26	864
27	8784
28	14544
29	4464
30	144
31	120
32	6840
33	36240
34	36240
35	6840
36	120
37	8280
38	147720
39	471120
40	353520
41	55320
42	840
43	720
44	86400
45	857520
46	1739520
47	857520
48	86400
49	720
50	96480

[1, 1, 2, 1, 1, 5, 3, 2, 8, 2, 20, 44, 8, 6, 66, 66, 6, 114, 594, 414, 30, 24, 624, 1584, 624, 24, 864, 8784, 14544, 4464, 144, 120, 6840, 36240, 36240, 6840, 120, 8280, 147720, 471120, 353520, 55320, 840, 720, 86400, 857520, 1739520, 857520, 86400, 720, 96480]

cp's OEIS Frontend

A232187 Number T(n,k) of parity alternating permutations of [n] with exactly k descents from odd to even numbers; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/2)), read by rows.

Table of values

List of values