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.

0, 0, 18, 1236, 46812, 1592348, 54926890, 1988261908, 75922639116, 3044977814280, 127417950149256, 5527784646050032, 247288999212565632, 11357451257590359840, 533618856431642996126, 25573783371050570978268, 1247199857452953231731592, 61772272799794134860411162

Offset: 1

Author

R. H. Hardin, Dec 25 2014

Keywords

• nonn

Crossrefs

Diagonal of A252976.

Extensions

a(16)-a(18) from Alois P. Heinz, Feb 07 2019