Number of n X n nonnegative integer arrays with upper left 0 and lower right n+n-5 and value increasing by 0 or 1 with every step right or down.

A252969

Number of n X n nonnegative integer arrays with upper left 0 and lower right n+n-5 and value increasing by 0 or 1 with every step right or down.

Terms

    a(0) =0a(1) =0a(2) =18a(3) =1236a(4) =46812a(5) =1592348a(6) =54926890a(7) =1988261908a(8) =75922639116

External references