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 A232299 #6 Jul 23 2025 07:16:37 %S A232299 1,1727,240241,25116353,2885285507,339565321435,39660722273643, %T A232299 4626194825153697,539876319125367771,63007847133734278905, %U A232299 7353315697711530754635,858164092027643141044841 %N A232299 Number of 5Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally. %C A232299 Row 5 of A232295 %H A232299 R. H. Hardin, <a href="/A232299/b232299.txt">Table of n, a(n) for n = 1..210</a> %e A232299 Some solutions for n=2 %e A232299 ..1..2....1..2....2..2....2..2....1..2....1..2....0..1....2..1....2..1....2..2 %e A232299 ..1..1....2..1....2..2....1..2....2..2....1..2....2..2....2..2....0..2....1..2 %e A232299 ..2..2....2..2....2..2....2..0....2..2....1..0....1..0....0..1....1..1....1..1 %e A232299 ..2..0....2..1....2..1....1..2....0..1....2..1....1..2....2..1....2..1....2..1 %e A232299 ..1..2....2..1....1..2....2..1....2..1....0..2....1..2....2..2....2..2....1..2 %K A232299 nonn %O A232299 1,2 %A A232299 _R. H. Hardin_, Nov 22 2013