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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.

A221924 Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.

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%I A221924 #5 Jul 23 2025 02:19:47
%S A221924 13,3487,508281,75313013,11143187999,1648683705320,243924224883451,
%T A221924 36085841660921104,5338383610734905950,789733272292081157838
%N A221924 Number of nX4 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.
%C A221924 Column 4 of A221925
%e A221924 Some solutions for n=3
%e A221924 ..0..0..0..1....0..2..1..3....0..4..0..3....0..1..2..0....0..3..0..1
%e A221924 ..0..5..0..0....0..0..0..1....0..1..0..0....0..2..0..1....0..2..1..1
%e A221924 ..1..3..0..2....2..1..1..1....0..3..1..0....1..0..3..2....3..0..1..0
%K A221924 nonn
%O A221924 1,1
%A A221924 _R. H. Hardin_ Jan 31 2013

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