A321064 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=8.

654424, 19209584, 769534688, 39729927744, 2548520444480, 197890932247680, 18237517555977472, 1964023269922621952, 244043425473888612352, 34621419911316556017664, 5557654485553447834816512, 1001744885342172367869042688, 201381195927539873971774119936

Offset

8,1

Links

Table of n, a(n) for n=8..20.

Crossrefs

Column k=8 of A262372.

Sequence in context: A105002 A162892 A232675 * A186614 A251279 A205941

Adjacent sequences: A321061 A321062 A321063 * A321065 A321066 A321067

Keyword

nonn

Author

Alois P. Heinz, Oct 26 2018

Status

approved