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 A195275 #7 Jul 22 2025 12:43:25 %S A195275 1,121,107811,724789395,37235577669213,14698398557250127027, %T A195275 44727914263743356875711779,1051443054205968885835418306282537 %N A195275 Number of lower triangles of an n X n integer array with each element differing from all of its vertical and horizontal neighbors by 5 or less and triangles differing by a constant counted only once. %C A195275 Column 5 of A195278 %e A195275 Some solutions for n=5 %e A195275 ...0...............0...............0...............0...............0 %e A195275 ..-5.-5...........-2..3............0..0............0..5...........-3.-4 %e A195275 ...0..0.-4........-2.-2.-2.........0.-1.-5.........0..0..3........-1.-4.-3 %e A195275 ...3..2.-3.-3.....-1.-4.-3.-8......5..4..0..0......0..2..1..0......1.-2..1..3 %e A195275 ...3.-2..1.-1..2...2.-3.-6.-7.-6...9..8..5..1.-4...0..3..2..3..2..-1.-2.-1.-1.-3 %K A195275 nonn %O A195275 1,2 %A A195275 _R. H. Hardin_ Sep 14 2011