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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.

A183518 Number of n X n 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.

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%I A183518 #8 Jul 22 2025 09:03:18
%S A183518 1,9,101,3507,371691,89738569
%N A183518 Number of n X n 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.
%C A183518 Diagonal of A183526
%e A183518 Some solutions for 3X3
%e A183518 ..0..0..2....2..2..2....1..1..1....0..0..0....0..1..0....2..0..0....1..2..0
%e A183518 ..0..2..0....0..1..0....1..1..0....0..1..0....2..1..2....2..0..1....1..1..1
%e A183518 ..0..0..0....0..0..0....1..0..1....1..0..0....1..1..0....0..0..1....0..2..0
%K A183518 nonn
%O A183518 1,2
%A A183518 _R. H. Hardin_ Jan 05 2011

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