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 A231845 #6 Jul 23 2025 06:44:02 %S A231845 16384,2771101,1792092360,1140658285204,899426070636904, %T A231845 667414220139740867,474822731471136470440,334792455203826918639864, %U A231845 237921869830701207980327586,170048147255195659833743734040 %N A231845 Number of 7Xn 0..3 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors. %C A231845 Row 7 of A231839 %H A231845 R. H. Hardin, <a href="/A231845/b231845.txt">Table of n, a(n) for n = 1..19</a> %e A231845 Some solutions for n=2 %e A231845 ..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0 %e A231845 ..0..0....2..2....0..0....0..0....2..0....0..2....0..0....0..0....2..0....2..2 %e A231845 ..1..2....2..0....2..2....0..0....0..0....0..0....2..1....0..3....0..0....2..2 %e A231845 ..2..3....0..0....3..1....2..3....2..2....0..2....1..3....3..3....1..0....3..2 %e A231845 ..3..0....0..1....1..3....1..1....3..1....3..1....3..2....0..0....0..3....1..0 %e A231845 ..0..0....2..2....2..2....0..0....1..2....0..0....2..3....3..2....3..2....0..2 %e A231845 ..2..3....0..0....0..0....0..0....2..3....0..0....3..3....0..0....0..0....1..1 %K A231845 nonn %O A231845 1,1 %A A231845 _R. H. Hardin_, Nov 14 2013