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.
%I A183824 #6 Jul 22 2025 09:13:02 %S A183824 50625,128578815,323115202755,814479338538099,2051388696859571241, %T A183824 5167876666358771202411,13018181193595377140956551 %N A183824 1/256 the number of (n+1)X6 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor. %C A183824 Column 5 of A183827 %e A183824 Some solutions with upper left block zero for 3X6 %e A183824 ..0..0..2..2..0..2....0..0..2..2..0..3....0..0..2..2..0..0....0..0..2..0..0..3 %e A183824 ..0..0..0..1..0..2....0..0..0..1..0..2....0..0..0..2..0..0....0..0..0..2..0..0 %e A183824 ..3..1..0..1..3..1....3..3..0..2..1..0....2..2..0..1..3..3....0..1..3..2..2..1 %K A183824 nonn %O A183824 1,1 %A A183824 _R. H. Hardin_ Jan 07 2011