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 A230705 #6 Jul 23 2025 05:57:50 %S A230705 348,6576,130446,2382398,43853402,801845362,14669811856,268320990890, %T A230705 4907081716780,89741960163156,1641217724600070,30014492191668694, %U A230705 548906193959555044,10038390389027140378,183582034355172126804 %N A230705 Number of (n+3)X(5+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero. %C A230705 Column 5 of A230708 %H A230705 R. H. Hardin, <a href="/A230705/b230705.txt">Table of n, a(n) for n = 1..210</a> %e A230705 Some solutions for n=2 %e A230705 ..0..x..2..x..2..x..2..x....0..x..0..x..0..x..1..x....0..x..2..x..2..x..0..x %e A230705 ..x..1..x..0..x..0..x..1....x..1..x..1..x..2..x..0....x..1..x..0..x..1..x..0 %e A230705 ..0..x..0..x..1..x..0..x....0..x..2..x..0..x..2..x....0..x..2..x..1..x..1..x %e A230705 ..x..2..x..0..x..2..x..2....x..2..x..0..x..2..x..1....x..2..x..1..x..2..x..0 %e A230705 ..1..x..1..x..2..x..1..x....1..x..1..x..1..x..0..x....1..x..0..x..0..x..2..x %K A230705 nonn %O A230705 1,1 %A A230705 _R. H. Hardin_, Oct 28 2013