Number of n X n nonnegative integer arrays with upper left 0 and lower right 2n-4 and value increasing by 0 or 1 with every step right or down.

A252869

Number of n X n nonnegative integer arrays with upper left 0 and lower right 2n-4 and value increasing by 0 or 1 with every step right or down.

Terms

    a(0) =0a(1) =1a(2) =44a(3) =615a(4) =7313a(5) =85801a(6) =1030330a(7) =12742873a(8) =161937617a(9) =2105918045a(10) =27918122131a(11) =376111502977

External references