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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.

A183546 Number of n X n 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

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%I A183546 #8 Jul 22 2025 09:05:05
%S A183546 0,15,583,95101,63868351,177385265619,2043774880960645,
%T A183546 97587614786720584857
%N A183546 Number of n X n 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183546 Diagonal of A183554
%e A183546 Some solutions for 3X3
%e A183546 ..1..1..1....0..1..1....1..1..1....1..1..1....2..0..0....1..1..1....0..0..0
%e A183546 ..1..1..0....0..0..1....1..1..1....2..2..1....2..2..0....1..0..0....0..0..2
%e A183546 ..1..1..0....0..0..1....1..0..0....0..0..1....1..1..1....0..0..0....2..2..2
%K A183546 nonn
%O A183546 1,2
%A A183546 _R. H. Hardin_ Jan 05 2011

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