  We study three dimensional array of numbers $B(n,k,j)$, $0\le j,k\le n$,
where $B(n,k,j)$ is the number of type $B$ permutations of order $n$ with $k$
descents and $j$ minus signs. We prove in particular, that
$b(n,k,j):=B(n,k,j)/\binom{n}{j}$ is an integer and provide two combinatorial
interpretations for these numbers.
