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 A267250 #3 Jan 12 2016 09:11:01 %S A267250 8,255,5804,129129,2499080,43555569,683027146,9748574556,127531124302, %T A267250 1540596418525,17291858116440,181338323456395,1785428392643952, %U A267250 16575758386318547 %N A267250 Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing. %C A267250 Row 7 of A267245. %e A267250 Some solutions for n=4 %e A267250 ..0..0..0..0....0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..0 %e A267250 ..0..0..0..1....0..1..1..0....0..0..1..1....0..0..1..0....0..0..0..1 %e A267250 ..0..0..0..1....0..1..1..0....0..1..1..0....0..0..1..0....0..0..0..1 %e A267250 ..0..0..1..0....1..0..1..0....0..1..1..0....0..1..0..0....0..0..1..0 %e A267250 ..0..0..1..0....0..1..0..1....1..0..0..1....1..0..0..0....0..1..0..0 %e A267250 ..1..1..1..0....1..0..1..0....1..1..0..1....1..1..0..0....0..0..1..0 %e A267250 ..0..1..1..1....1..1..1..1....1..1..1..0....1..0..1..1....0..0..0..1 %Y A267250 Cf. A267245. %K A267250 nonn %O A267250 1,1 %A A267250 _R. H. Hardin_, Jan 12 2016