A321065 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=9.

23136128, 873274112, 43316046592, 2700561836672, 205352644205568, 18629724957708800, 1982309731660474368, 244043425473888612352, 34372758116984213536768, 5486719044572824902107136, 984593144718697864983347200, 197245981020715237398610116608

Offset

9,1

Links

Table of n, a(n) for n=9..20.

Crossrefs

Column k=9 of A262372.

Sequence in context: A204414 A114666 A157079 * A183736 A105238 A252396

Adjacent sequences: A321062 A321063 A321064 * A321066 A321067 A321068

Keyword

nonn

Author

Alois P. Heinz, Oct 26 2018

Status

approved