A262241 - cp's OEIS frontend

A262241 Number of ordered pairs (p,q) of permutations of [n] with complementary up-down signatures and p(1)=q(1) if n>0.

n	a(n)
0	1
1	1
2	0
3	2
4	12
5	144
6	2456
7	58376
8	1836064
9	73967072
10	3714221440
11	227511703296
12	16699185465088
13	1446996011652864
14	146157945571218944
15	17023105015524481536
16	2264733463688117325824
17	341323210761171895406592
18	57851227793596711612702720

[1, 1, 0, 2, 12, 144, 2456, 58376, 1836064, 73967072, 3714221440, 227511703296, 16699185465088, 1446996011652864, 146157945571218944, 17023105015524481536, 2264733463688117325824, 341323210761171895406592, 57851227793596711612702720]

cp's OEIS Frontend

A262241 Number of ordered pairs (p,q) of permutations of [n] with complementary up-down signatures and p(1)=q(1) if n>0.

Table of values

List of values