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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.

A221941 Number of 5Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.

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%I A221941 #5 Jul 23 2025 02:21:59
%S A221941 1,2627,376389,84547866,17626884659,3719159201319,782051177169672,
%T A221941 164583386567947853,34629683921533060992,7286522628060662000197
%N A221941 Number of 5Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.
%C A221941 Row 5 of A221937
%e A221941 Some solutions for n=3
%e A221941 ..0..2..0....0..1..0....0..2..0....0..3..0....0..2..1....0..3..1....0..2..1
%e A221941 ..0..3..0....3..1..0....1..2..0....0..3..1....1..2..1....0..1..1....0..3..2
%e A221941 ..0..4..2....1..3..2....0..4..2....1..0..0....0..0..1....0..2..1....0..0..2
%e A221941 ..0..0..0....0..0..2....0..0..2....0..4..1....2..1..2....1..0..1....1..0..1
%e A221941 ..1..2..1....1..1..0....1..1..0....0..1..1....1..1..0....2..0..2....1..0..2
%K A221941 nonn
%O A221941 1,2
%A A221941 _R. H. Hardin_ Feb 01 2013

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