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 A188389 #10 May 18 2020 03:00:44 %S A188389 52,1750,35775,507549,5442547,46757209,335279744,2067951459, %T A188389 11224133015,54571222450,241058398756,978630346891,3686088206746, %U A188389 12983700750813,43054563334197,135177521790982,403818954811225,1152699706324158 %N A188389 Number of (5*n) X 5 binary arrays with rows in nonincreasing order and n ones in every column. %H A188389 R. H. Hardin, <a href="/A188389/b188389.txt">Table of n, a(n) for n = 1..19</a> %e A188389 Some solutions for 10 X 5: %e A188389 ..1..0..0..0..1....1..1..0..1..0....1..1..1..1..1....1..1..0..0..0 %e A188389 ..1..0..0..0..0....1..0..0..1..0....1..0..1..0..0....1..1..0..0..0 %e A188389 ..0..1..0..1..1....0..1..0..0..0....0..1..0..0..0....0..0..1..1..1 %e A188389 ..0..1..0..0..0....0..0..1..0..0....0..0..0..1..0....0..0..1..1..0 %e A188389 ..0..0..1..0..0....0..0..1..0..0....0..0..0..0..1....0..0..0..0..1 %e A188389 ..0..0..1..0..0....0..0..0..0..1....0..0..0..0..0....0..0..0..0..0 %e A188389 ..0..0..0..1..0....0..0..0..0..1....0..0..0..0..0....0..0..0..0..0 %e A188389 ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 %e A188389 ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 %e A188389 ..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 %Y A188389 Column 5 of A188392. %K A188389 nonn %O A188389 1,1 %A A188389 _R. H. Hardin_, Mar 30 2011