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 A208094 #13 May 18 2020 03:01:23 %S A208094 1,5,377,169064,235862938,746823293346,4493602584256529, %T A208094 45881957995776221396,734971289403287420883126, %U A208094 17434398033181126785548889533,585880828202059360820577364423099,26929433656271781956071918468836389588,1645382407173932261418519657416983542506695 %N A208094 Number of n X 4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). %H A208094 Andrew Howroyd, <a href="/A208094/b208094.txt">Table of n, a(n) for n = 0..100</a> %e A208094 Some solutions for n=4 %e A208094 ..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1 %e A208094 ..0..1..0..2....0..1..0..1....0..1..2..1....0..1..0..1....0..1..0..2 %e A208094 ..2..1..0..1....2..1..0..2....0..1..0..1....0..2..0..1....2..1..0..1 %e A208094 ..0..1..2..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..2 %Y A208094 Column 4 of A208096. %K A208094 nonn %O A208094 0,2 %A A208094 _R. H. Hardin_, Feb 23 2012 %E A208094 a(0)=1 prepended and terms a(8) and beyond from _Andrew Howroyd_, May 17 2020