A262372 - cp's OEIS frontend

A262372 Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	2
9	2
10	0
11	10
12	8
13	8
14	10
15	0
16	88
17	68
18	64
19	68
20	88
21	0
22	1216
23	952
24	852
25	852
26	952
27	1216
28	0
29	24176
30	19312
31	17008
32	16328
33	17008
34	19312
35	24176
36	0
37	654424
38	533544
39	467696
40	438496
41	438496
42	467696
43	533544
44	654424

[1, 0, 1, 0, 1, 1, 0, 2, 2, 2, 0, 10, 8, 8, 10, 0, 88, 68, 64, 68, 88, 0, 1216, 952, 852, 852, 952, 1216, 0, 24176, 19312, 17008, 16328, 17008, 19312, 24176, 0, 654424, 533544, 467696, 438496, 438496, 467696, 533544, 654424]

cp's OEIS Frontend

A262372 Number T(n,k) of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=k if n>0; triangle T(n,k), n>=0, 0<=k<=n, read by rows.

Table of values

List of values