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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.

A183818 1/81 the number of (n+1)X8 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

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%I A183818 #6 Jul 22 2025 09:12:24
%S A183818 262144,536415300,1050517114472,2096961683069192,4156740912572653752
%N A183818 1/81 the number of (n+1)X8 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.
%C A183818 Column 7 of A183819
%e A183818 Some solutions with upper left block zero for 3X8
%e A183818 ..0..0..0..2..0..2..0..2....0..0..0..1..0..1..0..1....0..0..0..1..0..0..0..2
%e A183818 ..0..0..1..1..0..2..1..0....0..0..1..1..0..2..1..0....0..0..1..2..0..2..1..0
%e A183818 ..2..1..0..1..0..1..0..1....1..1..0..0..0..0..0..0....1..1..1..2..0..1..0..1
%K A183818 nonn
%O A183818 1,1
%A A183818 _R. H. Hardin_ Jan 07 2011

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