A321061 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=5.

88, 952, 17008, 438496, 15214848, 678914816, 37727416576, 2548520444480, 205352644205568, 19438574276705792, 2134484763328610304, 269000435778983860224, 38553984887490450800640, 6234291052542667315675136, 1129460021283312750345682944

Offset

5,1

Links

Table of n, a(n) for n=5..19.

Crossrefs

Column k=5 of A262372.

Sequence in context: A157730 A055749 A227479 * A295591 A182676 A228744

Adjacent sequences: A321058 A321059 A321060 * A321062 A321063 A321064

Keyword

nonn

Author

Alois P. Heinz, Oct 26 2018

Status

approved