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A251121 Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 0

%I

%S 10,40,108,266,580,1214,2420,4702,8926,16680,30766,56180,101734,

%T 182956,327080,581742,1030000,1816290,3191136,5588050,9755530,

%U 16983260,29489098

%N Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

%C Diagonal of A251128

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 30 2014

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Last modified April 23 05:30 EDT 2021. Contains 343199 sequences. (Running on oeis4.)