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 A183825 #6 Jul 22 2025 09:13:09 %S A183825 759375,6954559893,62851591581012,570213177028325955, %T A183825 5167876666358771202411 %N A183825 1/256 the number of (n+1)X7 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor. %C A183825 Column 6 of A183827 %e A183825 Some solutions with upper left block zero for 3X7 %e A183825 ..0..0..2..0..0..0..3....0..0..0..0..1..0..0....0..0..0..0..1..0..2 %e A183825 ..0..0..2..2..0..0..0....0..0..3..2..0..0..1....0..0..1..2..0..0..1 %e A183825 ..2..0..1..0..1..0..0....2..0..1..0..2..0..2....1..0..3..0..3..0..0 %K A183825 nonn %O A183825 1,1 %A A183825 _R. H. Hardin_ Jan 07 2011