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 A232301 #6 Jul 23 2025 07:16:50 %S A232301 1,40867,43963319,30690409685,24797475083765,20843967523877175, %T A232301 17291702408190208843,14309005468246109828087, %U A232301 11852395942038473338742213,9819088600464792990304624339,8134045894315455725212916395019 %N A232301 Number of 7Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally. %C A232301 Row 7 of A232295 %H A232301 R. H. Hardin, <a href="/A232301/b232301.txt">Table of n, a(n) for n = 1..77</a> %e A232301 Some solutions for n=2 %e A232301 ..2..1....0..1....1..2....2..0....1..2....1..2....1..2....1..2....2..2....2..0 %e A232301 ..2..2....2..2....2..1....1..2....1..1....0..1....1..2....2..1....2..0....1..2 %e A232301 ..2..1....1..1....0..0....1..2....2..1....2..1....2..2....2..2....1..2....1..2 %e A232301 ..2..2....2..1....1..2....1..1....2..2....2..2....2..2....2..1....2..1....1..1 %e A232301 ..1..2....2..2....2..2....2..1....2..2....2..1....0..1....0..1....2..2....2..1 %e A232301 ..2..1....2..1....1..2....2..2....2..2....1..2....2..1....2..2....1..1....0..2 %e A232301 ..2..2....0..2....1..0....2..2....2..2....2..1....1..2....2..2....2..2....1..2 %K A232301 nonn %O A232301 1,2 %A A232301 _R. H. Hardin_, Nov 22 2013