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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.
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%I #10 Feb 07 2019 14:29:32

%S 0,0,18,1236,46812,1592348,54926890,1988261908,75922639116,

%T 3044977814280,127417950149256,5527784646050032,247288999212565632,

%U 11357451257590359840,533618856431642996126,25573783371050570978268,1247199857452953231731592,61772272799794134860411162

%N 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.

%Y Diagonal of A252976.

%K nonn

%O 1,3

%A _R. H. Hardin_, Dec 25 2014

%E a(16)-a(18) from _Alois P. Heinz_, Feb 07 2019