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 A223743 #7 Jul 23 2025 04:27:01 %S A223743 3,3,9,9,39,43,195,243,1209,1539,8007,10557,56277,75595,409431,558117, %T A223743 3061119,4218077,23357223,32466849,181185495,253624579,1424453499, %U A223743 2005655781,11325017397,16024596491,90896159565,129159081787 %N A223743 Number of nX1 0..2 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope. %C A223743 Column 1 of A223747 %H A223743 R. H. Hardin, <a href="/A223743/b223743.txt">Table of n, a(n) for n = 1..210</a> %e A223743 Some solutions for n=6 %e A223743 ..2....0....1....1....2....0....2....2....1....0....2....0....1....1....1....0 %e A223743 ..1....1....1....1....1....1....2....0....0....2....1....2....2....0....2....1 %e A223743 ..0....2....0....2....0....2....0....1....2....2....1....1....1....2....2....1 %e A223743 ..0....2....2....0....2....0....0....1....1....2....1....2....2....2....0....1 %e A223743 ..1....1....2....0....2....0....2....0....2....2....1....0....0....0....1....1 %e A223743 ..2....0....0....2....1....1....2....2....0....0....2....1....2....1....2....0 %K A223743 nonn %O A223743 1,1 %A A223743 _R. H. Hardin_ Mar 27 2013