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 A233081 #6 Jul 23 2025 07:51:31 %S A233081 365,226895,141615905,88417171553,55204524946337,34467813715307081, %T A233081 21520525142517911969,13436680693956706599305, %U A233081 8389404393896088886849313,5238057500238107310826087913,3270464157841452851203199640929 %N A233081 Number of nX7 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order. %C A233081 Column 7 of A233082 %H A233081 R. H. Hardin, <a href="/A233081/b233081.txt">Table of n, a(n) for n = 1..210</a> %F A233081 Empirical: a(n) = 693*a(n-1) -44261*a(n-2) +890611*a(n-3) -7150206*a(n-4) +22034516*a(n-5) -15731352*a(n-6) %e A233081 Some solutions for n=1 %e A233081 ..0..0..1..1..1..0..0....0..1..1..3..3..3..3....0..0..1..0..0..0..0 %K A233081 nonn %O A233081 1,1 %A A233081 _R. H. Hardin_, Dec 03 2013