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 A265971 #4 Dec 19 2015 09:46:30 %S A265971 4616,190308,339952,721864,1820904,5006296,13435392,35632192,95276272, %T A265971 261736272,709324400,1927403116,5292526288,14866077768,40973803912, %U A265971 112866192572,314639453512,897120499588,2505530846832,6976518689796 %N A265971 Number of nX6 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique. %C A265971 Column 6 of A265973. %H A265971 R. H. Hardin, <a href="/A265971/b265971.txt">Table of n, a(n) for n = 1..210</a> %e A265971 Some solutions for n=2 %e A265971 ..0..4..3..0..0..1....2..0..0..1..3..3....1..1..3..3..1..2....1..3..3..4..4..3 %e A265971 ..0..1..3..2..2..3....1..3..3..1..0..0....4..0..0..4..4..0....2..4..1..0..0..3 %Y A265971 Cf. A265973. %K A265971 nonn %O A265971 1,1 %A A265971 _R. H. Hardin_, Dec 19 2015