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 A222843 #9 Mar 02 2025 10:03:08 %S A222843 1,3,16,48,185,534,1873,5397,17853,51516,165882,480321,1519997, %T A222843 4419336,13827716,40372992,125335640,367166796,1133563870,3330422526, %U A222843 10238553681,30154137624,92399944682,272682432123,833404227103,2463640724667 %N A222843 Number of (n+1) X 2 0..2 arrays with every row and column least squares fitting to a positive slope straight line. %H A222843 R. H. Hardin, <a href="/A222843/b222843.txt">Table of n, a(n) for n = 1..46</a> %e A222843 Some solutions for n=3: %e A222843 ..0..2....0..1....0..1....0..1....0..2....0..1....0..1....0..1....0..1....0..2 %e A222843 ..0..1....0..2....1..2....0..2....0..1....0..1....1..2....0..1....0..1....0..1 %e A222843 ..1..2....0..1....0..1....1..2....0..2....0..1....0..2....1..2....0..2....1..2 %e A222843 ..1..2....1..2....1..2....0..2....1..2....1..2....1..2....0..2....1..2....0..2 %Y A222843 Column 1 of A222847. %K A222843 nonn %O A222843 1,2 %A A222843 _R. H. Hardin_, Mar 07 2013