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 A204629 #7 Jul 22 2025 18:11:27 %S A204629 3145728,9076721064,26194503047262,75595484720747496, %T A204629 218163372078770313246,629604521519860258105194, %U A204629 1816995451072561641887723586,5243724206237325303462055283538 %N A204629 Number of (n+1)X8 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order. %C A204629 Column 7 of A204630 %H A204629 R. H. Hardin, <a href="/A204629/b204629.txt">Table of n, a(n) for n = 1..210</a> %e A204629 Some solutions for n=3 %e A204629 ..0..0..0..0..0..0..0..0....0..1..1..0..1..2..1..2....0..0..0..1..1..0..2..1 %e A204629 ..0..1..2..2..1..0..2..0....0..1..2..1..2..0..0..1....0..1..0..2..0..0..2..1 %e A204629 ..1..2..2..1..1..2..2..1....0..2..0..1..2..0..1..1....0..2..0..2..1..0..1..0 %e A204629 ..0..2..1..0..2..0..2..2....0..2..1..1..2..0..0..1....0..2..1..0..0..2..2..1 %K A204629 nonn %O A204629 1,1 %A A204629 _R. H. Hardin_ Jan 17 2012