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 A195953 #7 Jul 22 2025 12:48:04 %S A195953 1,4,2,3,7,8,10,8,8,94,118,50 %N A195953 Number of lower triangles of an n X n 0..8 array with each element equal to the number of its diagonal, antidiagonal, horizontal and vertical neighbors unequal to itself. %e A195953 Some solutions for n=10 %e A195953 ..2....................2....................2 %e A195953 ..3.3..................3.3..................3.3 %e A195953 ..4.6.3................4.7.3................5.7.3 %e A195953 ..4.6.7.3..............4.8.6.3..............4.8.4.3 %e A195953 ..5.8.6.6.3............5.7.6.7.3............5.4.4.4.3 %e A195953 ..4.7.5.5.7.3..........4.7.8.6.6.3..........4.8.7.4.6.3 %e A195953 ..4.7.5.5.8.6.3........5.4.4.4.4.4.3........5.7.4.4.6.7.3 %e A195953 ..5.8.6.6.7.6.7.3......4.7.4.4.6.4.4.3......4.8.4.4.8.6.6.3 %e A195953 ..4.7.7.6.7.8.6.6.3....5.8.7.6.6.4.8.7.3....4.7.7.4.7.7.8.7.3 %e A195953 ..3.4.5.4.4.5.4.4.3.2..3.4.4.5.4.5.4.5.3.2..3.5.4.5.4.5.4.4.3.2 %K A195953 nonn %O A195953 1,2 %A A195953 _R. H. Hardin_ Sep 25 2011