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 A209046 #7 Jul 22 2025 21:36:20 %S A209046 2916,15778340,86878417604,478881915072688,2640002203816927226, %T A209046 14554067523333615991960,80235179157233210417254036, %U A209046 442328880747673272994524595152,2438516891360121789946284774426192 %N A209046 Number of nX7 0..3 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it. %C A209046 Column 7 of A209047 %H A209046 R. H. Hardin, <a href="/A209046/b209046.txt">Table of n, a(n) for n = 1..210</a> %e A209046 Some solutions for n=4 %e A209046 ..0..3..0..1..0..3..0....2..0..3..0..3..2..3....3..2..0..1..0..3..0 %e A209046 ..3..2..2..0..1..0..1....0..1..3..0..3..2..1....1..3..2..2..2..1..2 %e A209046 ..1..0..3..2..1..2..3....1..2..2..3..0..0..1....2..0..2..3..1..3..1 %e A209046 ..3..0..3..2..2..0..1....0..3..3..0..3..1..3....0..3..3..0..2..1..3 %K A209046 nonn %O A209046 1,1 %A A209046 _R. H. Hardin_ Mar 04 2012