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 A188447 #14 Dec 17 2018 02:29:55 %S A188447 1,0,0,0,205,250735,425677958,1184910460297,5319037255069867, %T A188447 37061043058189077109,385952934535384722609921, %U A188447 5808709067366205646755198576,122705633165265276505954301866183,3547341635706102198376777462145800378,137294155514669462885867305539515979061866 %N A188447 Number of (5*n) X n binary arrays with nonzero rows in decreasing order and 5 ones in every column. %H A188447 Andrew Howroyd, <a href="/A188447/b188447.txt">Table of n, a(n) for n = 0..40</a> %e A188447 Some solutions for 20 X 4: %e A188447 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 0 1 %e A188447 1 1 1 0 1 1 0 1 1 1 0 1 1 1 0 1 1 0 1 1 %e A188447 1 1 0 1 1 0 1 1 1 1 0 0 1 0 1 1 1 0 1 0 %e A188447 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 %e A188447 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 0 1 0 0 0 %e A188447 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 1 %e A188447 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 0 1 1 0 %e A188447 0 0 1 1 0 1 0 0 0 0 1 1 0 1 0 1 0 1 0 1 %e A188447 0 0 0 0 0 0 1 1 0 0 1 0 0 0 0 1 0 1 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %e A188447 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 %Y A188447 Row 5 of A188445. %K A188447 nonn %O A188447 0,5 %A A188447 _R. H. Hardin_, Mar 31 2011 %E A188447 a(0)=1 prepended and terms a(9) and beyond from _Andrew Howroyd_, Dec 15 2018