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

1,3

Links

Table of n, a(n) for n=1..18.

Crossrefs

Diagonal of A252976.

Sequence in context: A152933 A360602 A177602 * A182286 A292609 A275047

Adjacent sequences: A252966 A252967 A252968 * A252970 A252971 A252972

Keyword

nonn

Author

R. H. Hardin, Dec 25 2014

Extensions

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

Status

approved