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 A265968 #4 Dec 19 2015 09:44:26 %S A265968 92,1504,6112,23920,89776,339952,1282192,4848664,18309816,69096768, %T A265968 260725200,984425248,3713747128,14013775968,52889517856,199579642728, %U A265968 753070588072,2841950773104,10724343546776,40468052281360 %N A265968 Number of nX3 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique. %C A265968 Column 3 of A265973. %H A265968 R. H. Hardin, <a href="/A265968/b265968.txt">Table of n, a(n) for n = 1..210</a> %e A265968 Some solutions for n=4 %e A265968 ..0..3..1....3..3..2....4..0..2....1..1..2....3..4..2....3..0..1....0..3..1 %e A265968 ..1..3..4....1..1..0....1..3..2....0..4..4....0..0..2....3..4..1....0..4..4 %e A265968 ..1..0..4....4..4..0....1..3..0....0..3..1....1..1..3....1..4..3....2..1..3 %e A265968 ..4..0..1....0..3..3....4..4..1....2..3..0....3..4..0....0..0..3....2..1..3 %Y A265968 Cf. A265973. %K A265968 nonn %O A265968 1,1 %A A265968 _R. H. Hardin_, Dec 19 2015