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 A222973 #9 Dec 04 2021 08:35:07 %S A222973 1,20,1884,37680,1492176,26342820,810566001,14317221700,374392387808, %T A222973 6675906932160,162189676788683,2927729818922000,67871228115916800, %U A222973 1241683361279242560 %N A222973 Number of 5 X (n+1) 0..1 arrays with every row least squares fitting to a positive-slope straight line and every column least squares fitting to a zero- or positive-slope straight line, with a single point array taken as having zero slope. %e A222973 Some solutions for n=3: %e A222973 0 0 1 0 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 1 %e A222973 0 1 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 0 1 0 %e A222973 0 1 0 1 0 0 1 0 0 1 1 1 0 0 1 1 0 0 1 0 %e A222973 0 0 1 1 0 1 0 1 0 1 1 1 1 0 1 1 0 0 1 1 %e A222973 0 1 1 1 0 1 1 1 0 1 1 1 0 0 1 1 1 0 1 1 %Y A222973 Row 5 of A222969. %K A222973 nonn,more %O A222973 1,2 %A A222973 _R. H. Hardin_, Mar 10 2013