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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A183576 Half the number of n X n 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

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%I A183576 #8 Jul 22 2025 09:06:04
%S A183576 0,14,814,240358,320224986,1988200387149,57140106100076100
%N A183576 Half the number of n X n 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183576 Diagonal of A183584
%e A183576 Some solutions with a(1,1)<=1 for 3X3
%e A183576 ..0..3..3....0..0..3....1..1..3....1..1..0....1..3..0....1..2..2....1..1..1
%e A183576 ..0..3..0....0..3..3....1..1..3....1..0..0....1..3..0....1..1..1....1..1..1
%e A183576 ..0..3..0....0..0..3....3..3..3....1..0..0....1..3..0....3..3..3....1..2..2
%K A183576 nonn
%O A183576 1,2
%A A183576 _R. H. Hardin_ Jan 05 2011

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