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 A266469 #5 Sep 05 2025 13:59:51 %S A266469 2,9,52,463,5371,77320,1231170,20115063,319006954,4768598707, %T A266469 66353854322,856330630443,10262183989448 %N A266469 Number of n X 7 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing. %C A266469 Column 7 of A266470. %e A266469 Some solutions for n=4 %e A266469 ..0..0..0..0..0..0..0....0..0..0..1..1..1..1....0..0..0..0..0..0..0 %e A266469 ..0..0..0..0..0..0..0....0..1..1..0..0..0..0....0..0..0..0..0..0..1 %e A266469 ..0..0..0..0..0..0..1....1..0..0..1..1..1..1....0..0..0..1..1..1..0 %e A266469 ..1..1..1..1..1..1..0....1..1..1..0..0..0..0....1..1..1..0..0..0..0 %Y A266469 Cf. A266470. %K A266469 nonn,changed %O A266469 1,1 %A A266469 _R. H. Hardin_, Dec 29 2015