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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.

A217267 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor.

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%I A217267 #15 Feb 22 2025 14:33:51
%S A217267 0,9,1472,2572816,48909857500,10211121295308649,
%T A217267 23397344246732649325860
%N A217267 Number of n X n arrays of occupancy after each element moves to some horizontal or vertical neighbor.
%e A217267 Some solutions for n=3:
%e A217267 ..1..1..2....2..1..1....0..0..1....2..1..1....0..2..1....0..1..2....1..1..0
%e A217267 ..1..0..2....2..1..0....3..1..2....1..0..1....1..0..1....1..1..3....1..0..0
%e A217267 ..1..1..0....0..2..0....2..0..0....1..2..0....1..1..2....0..0..1....1..3..2
%Y A217267 Diagonal of A217273.
%K A217267 nonn,hard,more
%O A217267 1,2
%A A217267 _R. H. Hardin_, Sep 29 2012

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