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A253488 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 0

%I #4 Jan 02 2015 19:23:33

%S 81,1377,4196,10477,32652,113573,415106,1561268,5980490,23190284,

%T 90686546,356759588,1409549210,5586667004

%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

%C Diagonal of A253495

%e Some solutions for n=4

%e ..1..1..1..2..1....0..2..2..1..2....1..2..2..2..2....1..2..1..1..1

%e ..2..1..1..2..1....0..1..1..0..1....1..1..1..1..1....1..1..0..0..0

%e ..2..1..1..2..1....1..2..2..1..2....2..2..2..2..2....2..2..1..1..1

%e ..1..0..0..1..0....1..2..2..1..2....2..2..2..2..2....1..1..0..0..0

%e ..2..1..1..2..1....1..2..2..1..2....1..1..1..1..2....1..1..0..1..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 02 2015

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Last modified July 13 21:44 EDT 2024. Contains 374288 sequences. (Running on oeis4.)