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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.

A183817 1/81 the number of (n+1)X7 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 A183817 #6 Jul 22 2025 09:12:16
%S A183817 32768,26630220,20864057480,16607782066704,13143529051807800,
%T A183817 10425296660739253420
%N A183817 1/81 the number of (n+1)X7 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.
%C A183817 Column 6 of A183819
%e A183817 Some solutions with upper left block zero for 3X7
%e A183817 ..0..0..0..0..0..2..1....0..0..0..0..2..0..1....0..0..0..0..2..2..0
%e A183817 ..0..0..2..2..1..1..1....0..0..1..1..0..0..1....0..0..2..2..2..2..1
%e A183817 ..1..0..1..0..2..1..0....2..0..2..0..1..1..0....1..0..2..0..1..1..0
%K A183817 nonn
%O A183817 1,1
%A A183817 _R. H. Hardin_ Jan 07 2011

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