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 A252067 #6 Jun 02 2025 10:45:12 %S A252067 92,152,1497,21862,480464,16789564,896763044,73759241675, %T A252067 9393184984375,1838801806417480,553960321837762317, %U A252067 257519518174289401204,184540608154581393175420,203698879433082432079178119 %N A252067 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4. %C A252067 Diagonal of A252075 %e A252067 Some solutions for n=4 %e A252067 ..2..2..2..2..2..2....2..2..1..2..2..2....2..2..2..1..2..2....1..2..2..2..2..1 %e A252067 ..1..2..2..2..2..2....1..2..2..2..1..2....2..2..2..2..2..2....2..2..2..2..2..2 %e A252067 ..2..2..2..1..2..2....2..2..2..2..2..2....2..2..2..2..2..2....2..1..2..2..2..2 %e A252067 ..2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..1..2 %e A252067 ..2..2..2..2..2..2....1..2..2..2..2..1....2..2..2..1..2..2....2..2..2..2..2..2 %e A252067 ..2..2..2..2..2..2....2..2..2..2..1..2....2..2..2..2..2..2....1..2..2..2..2..1 %K A252067 nonn %O A252067 1,1 %A A252067 _R. H. Hardin_, Dec 13 2014