A321062 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=6.

1216, 19312, 467696, 15608288, 678914816, 37083546112, 2475764410944, 197890932247680, 18629724957708800, 2038137238577944576, 256240757035057154048, 36670707901174666768384, 5924904192825339158446080, 1073049649261575998090559488

Offset

6,1

Links

Table of n, a(n) for n=6..19.

Crossrefs

Column k=6 of A262372.

Sequence in context: A068783 A331625 A235889 * A059287 A225759 A059669

Adjacent sequences: A321059 A321060 A321061 * A321063 A321064 A321065

Keyword

nonn

Author

Alois P. Heinz, Oct 26 2018

Status

approved