A321063 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=7.

24176, 533544, 16860608, 707767328, 37727416576, 2475764410944, 195463415776768, 18237517555977472, 1982309731660474368, 248048061418810109952, 35377310696428547145728, 5702015244617382235000832, 1030924606332352092323577856, 207727724955575700214833766400

Offset

7,1

Links

Table of n, a(n) for n=7..20.

Crossrefs

Column k=7 of A262372.

Sequence in context: A110405 A234112 A234165 * A309018 A253465 A251154

Adjacent sequences: A321060 A321061 A321062 * A321064 A321065 A321066

Keyword

nonn

Author

Alois P. Heinz, Oct 26 2018

Status

approved