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 A205472 #7 Jul 22 2025 18:54:59 %S A205472 2709,61978,1504556,38649376,1002405121,26272023365,690109737187, %T A205472 18179839278978,479230888858502,12644948875816236,333720627683258097, %U A205472 8810523515340428257,232623501031146386321,6142757563889683779852 %N A205472 Number of (n+1)X6 0..2 arrays with every 2X2 subblock having the same number of equal edges, and new values 0..2 introduced in row major order. %C A205472 Column 5 of A205475 %H A205472 R. H. Hardin, <a href="/A205472/b205472.txt">Table of n, a(n) for n = 1..210</a> %e A205472 Some solutions for n=4 %e A205472 ..0..0..0..1..2..2....0..0..1..0..1..2....0..0..1..0..2..1....0..0..0..0..0..0 %e A205472 ..0..1..0..1..1..1....0..1..1..0..1..1....1..0..0..0..2..1....0..1..0..1..1..0 %e A205472 ..0..0..0..0..0..1....0..0..0..0..0..0....0..0..2..2..2..2....0..0..0..0..0..0 %e A205472 ..2..0..1..0..1..1....2..0..1..0..2..0....0..2..2..0..2..0....0..1..0..1..0..1 %e A205472 ..2..0..1..1..1..2....0..0..1..0..2..2....0..2..0..0..2..2....0..0..0..1..1..1 %K A205472 nonn %O A205472 1,1 %A A205472 _R. H. Hardin_ Jan 27 2012